SemaDeclCXX.cpp revision 6e4337556efa700d5b4dceac22fa0dfbd1cdee8f
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().MicrosoftExt) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 // C++0x [dcl.constexpr]p1: If any declaration of a function or function 506 // template has a constexpr specifier then all its declarations shall 507 // contain the constexpr specifier. [Note: An explicit specialization can 508 // differ from the template declaration with respect to the constexpr 509 // specifier. -- end note] 510 // 511 // FIXME: Don't reject changes in constexpr in explicit specializations. 512 if (New->isConstexpr() != Old->isConstexpr()) { 513 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 514 << New << New->isConstexpr(); 515 Diag(Old->getLocation(), diag::note_previous_declaration); 516 Invalid = true; 517 } 518 519 if (CheckEquivalentExceptionSpec(Old, New)) 520 Invalid = true; 521 522 return Invalid; 523} 524 525/// \brief Merge the exception specifications of two variable declarations. 526/// 527/// This is called when there's a redeclaration of a VarDecl. The function 528/// checks if the redeclaration might have an exception specification and 529/// validates compatibility and merges the specs if necessary. 530void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 531 // Shortcut if exceptions are disabled. 532 if (!getLangOptions().CXXExceptions) 533 return; 534 535 assert(Context.hasSameType(New->getType(), Old->getType()) && 536 "Should only be called if types are otherwise the same."); 537 538 QualType NewType = New->getType(); 539 QualType OldType = Old->getType(); 540 541 // We're only interested in pointers and references to functions, as well 542 // as pointers to member functions. 543 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 544 NewType = R->getPointeeType(); 545 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 546 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 547 NewType = P->getPointeeType(); 548 OldType = OldType->getAs<PointerType>()->getPointeeType(); 549 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 550 NewType = M->getPointeeType(); 551 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 552 } 553 554 if (!NewType->isFunctionProtoType()) 555 return; 556 557 // There's lots of special cases for functions. For function pointers, system 558 // libraries are hopefully not as broken so that we don't need these 559 // workarounds. 560 if (CheckEquivalentExceptionSpec( 561 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 562 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 563 New->setInvalidDecl(); 564 } 565} 566 567/// CheckCXXDefaultArguments - Verify that the default arguments for a 568/// function declaration are well-formed according to C++ 569/// [dcl.fct.default]. 570void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 571 unsigned NumParams = FD->getNumParams(); 572 unsigned p; 573 574 // Find first parameter with a default argument 575 for (p = 0; p < NumParams; ++p) { 576 ParmVarDecl *Param = FD->getParamDecl(p); 577 if (Param->hasDefaultArg()) 578 break; 579 } 580 581 // C++ [dcl.fct.default]p4: 582 // In a given function declaration, all parameters 583 // subsequent to a parameter with a default argument shall 584 // have default arguments supplied in this or previous 585 // declarations. A default argument shall not be redefined 586 // by a later declaration (not even to the same value). 587 unsigned LastMissingDefaultArg = 0; 588 for (; p < NumParams; ++p) { 589 ParmVarDecl *Param = FD->getParamDecl(p); 590 if (!Param->hasDefaultArg()) { 591 if (Param->isInvalidDecl()) 592 /* We already complained about this parameter. */; 593 else if (Param->getIdentifier()) 594 Diag(Param->getLocation(), 595 diag::err_param_default_argument_missing_name) 596 << Param->getIdentifier(); 597 else 598 Diag(Param->getLocation(), 599 diag::err_param_default_argument_missing); 600 601 LastMissingDefaultArg = p; 602 } 603 } 604 605 if (LastMissingDefaultArg > 0) { 606 // Some default arguments were missing. Clear out all of the 607 // default arguments up to (and including) the last missing 608 // default argument, so that we leave the function parameters 609 // in a semantically valid state. 610 for (p = 0; p <= LastMissingDefaultArg; ++p) { 611 ParmVarDecl *Param = FD->getParamDecl(p); 612 if (Param->hasDefaultArg()) { 613 Param->setDefaultArg(0); 614 } 615 } 616 } 617} 618 619// CheckConstexprParameterTypes - Check whether a function's parameter types 620// are all literal types. If so, return true. If not, produce a suitable 621// diagnostic depending on @p CCK and return false. 622static bool CheckConstexprParameterTypes(Sema &SemaRef, const FunctionDecl *FD, 623 Sema::CheckConstexprKind CCK) { 624 unsigned ArgIndex = 0; 625 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 626 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 627 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 628 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 629 SourceLocation ParamLoc = PD->getLocation(); 630 if (!(*i)->isDependentType() && 631 SemaRef.RequireLiteralType(ParamLoc, *i, CCK == Sema::CCK_Declaration ? 632 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 633 << ArgIndex+1 << PD->getSourceRange() 634 << isa<CXXConstructorDecl>(FD) : 635 SemaRef.PDiag(), 636 /*AllowIncompleteType*/ true)) { 637 if (CCK == Sema::CCK_NoteNonConstexprInstantiation) 638 SemaRef.Diag(ParamLoc, diag::note_constexpr_tmpl_non_literal_param) 639 << ArgIndex+1 << PD->getSourceRange() 640 << isa<CXXConstructorDecl>(FD) << *i; 641 return false; 642 } 643 } 644 return true; 645} 646 647// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 648// the requirements of a constexpr function declaration or a constexpr 649// constructor declaration. Return true if it does, false if not. 650// 651// This implements C++0x [dcl.constexpr]p3,4, as amended by N3308. 652// 653// \param CCK Specifies whether to produce diagnostics if the function does not 654// satisfy the requirements. 655bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD, 656 CheckConstexprKind CCK) { 657 assert((CCK != CCK_NoteNonConstexprInstantiation || 658 (NewFD->getTemplateInstantiationPattern() && 659 NewFD->getTemplateInstantiationPattern()->isConstexpr())) && 660 "only constexpr templates can be instantiated non-constexpr"); 661 662 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(NewFD)) { 663 // C++0x [dcl.constexpr]p4: 664 // In the definition of a constexpr constructor, each of the parameter 665 // types shall be a literal type. 666 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 667 return false; 668 669 // In addition, either its function-body shall be = delete or = default or 670 // it shall satisfy the following constraints: 671 // - the class shall not have any virtual base classes; 672 const CXXRecordDecl *RD = CD->getParent(); 673 if (RD->getNumVBases()) { 674 // Note, this is still illegal if the body is = default, since the 675 // implicit body does not satisfy the requirements of a constexpr 676 // constructor. We also reject cases where the body is = delete, as 677 // required by N3308. 678 if (CCK != CCK_Instantiation) { 679 Diag(NewFD->getLocation(), 680 CCK == CCK_Declaration ? diag::err_constexpr_virtual_base 681 : diag::note_constexpr_tmpl_virtual_base) 682 << RD->isStruct() << RD->getNumVBases(); 683 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 684 E = RD->vbases_end(); I != E; ++I) 685 Diag(I->getSourceRange().getBegin(), 686 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 687 } 688 return false; 689 } 690 } else { 691 // C++0x [dcl.constexpr]p3: 692 // The definition of a constexpr function shall satisfy the following 693 // constraints: 694 // - it shall not be virtual; 695 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 696 if (Method && Method->isVirtual()) { 697 if (CCK != CCK_Instantiation) { 698 Diag(NewFD->getLocation(), 699 CCK == CCK_Declaration ? diag::err_constexpr_virtual 700 : diag::note_constexpr_tmpl_virtual); 701 702 // If it's not obvious why this function is virtual, find an overridden 703 // function which uses the 'virtual' keyword. 704 const CXXMethodDecl *WrittenVirtual = Method; 705 while (!WrittenVirtual->isVirtualAsWritten()) 706 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 707 if (WrittenVirtual != Method) 708 Diag(WrittenVirtual->getLocation(), 709 diag::note_overridden_virtual_function); 710 } 711 return false; 712 } 713 714 // - its return type shall be a literal type; 715 QualType RT = NewFD->getResultType(); 716 if (!RT->isDependentType() && 717 RequireLiteralType(NewFD->getLocation(), RT, CCK == CCK_Declaration ? 718 PDiag(diag::err_constexpr_non_literal_return) : 719 PDiag(), 720 /*AllowIncompleteType*/ true)) { 721 if (CCK == CCK_NoteNonConstexprInstantiation) 722 Diag(NewFD->getLocation(), 723 diag::note_constexpr_tmpl_non_literal_return) << RT; 724 return false; 725 } 726 727 // - each of its parameter types shall be a literal type; 728 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 729 return false; 730 } 731 732 return true; 733} 734 735/// Check the given declaration statement is legal within a constexpr function 736/// body. C++0x [dcl.constexpr]p3,p4. 737/// 738/// \return true if the body is OK, false if we have diagnosed a problem. 739static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 740 DeclStmt *DS) { 741 // C++0x [dcl.constexpr]p3 and p4: 742 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 743 // contain only 744 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 745 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 746 switch ((*DclIt)->getKind()) { 747 case Decl::StaticAssert: 748 case Decl::Using: 749 case Decl::UsingShadow: 750 case Decl::UsingDirective: 751 case Decl::UnresolvedUsingTypename: 752 // - static_assert-declarations 753 // - using-declarations, 754 // - using-directives, 755 continue; 756 757 case Decl::Typedef: 758 case Decl::TypeAlias: { 759 // - typedef declarations and alias-declarations that do not define 760 // classes or enumerations, 761 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 762 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 763 // Don't allow variably-modified types in constexpr functions. 764 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 765 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 766 << TL.getSourceRange() << TL.getType() 767 << isa<CXXConstructorDecl>(Dcl); 768 return false; 769 } 770 continue; 771 } 772 773 case Decl::Enum: 774 case Decl::CXXRecord: 775 // As an extension, we allow the declaration (but not the definition) of 776 // classes and enumerations in all declarations, not just in typedef and 777 // alias declarations. 778 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 779 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 780 << isa<CXXConstructorDecl>(Dcl); 781 return false; 782 } 783 continue; 784 785 case Decl::Var: 786 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 787 << isa<CXXConstructorDecl>(Dcl); 788 return false; 789 790 default: 791 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 } 795 } 796 797 return true; 798} 799 800/// Check that the given field is initialized within a constexpr constructor. 801/// 802/// \param Dcl The constexpr constructor being checked. 803/// \param Field The field being checked. This may be a member of an anonymous 804/// struct or union nested within the class being checked. 805/// \param Inits All declarations, including anonymous struct/union members and 806/// indirect members, for which any initialization was provided. 807/// \param Diagnosed Set to true if an error is produced. 808static void CheckConstexprCtorInitializer(Sema &SemaRef, 809 const FunctionDecl *Dcl, 810 FieldDecl *Field, 811 llvm::SmallSet<Decl*, 16> &Inits, 812 bool &Diagnosed) { 813 if (!Inits.count(Field)) { 814 if (!Diagnosed) { 815 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 816 Diagnosed = true; 817 } 818 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 819 } else if (Field->isAnonymousStructOrUnion()) { 820 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 821 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 822 I != E; ++I) 823 // If an anonymous union contains an anonymous struct of which any member 824 // is initialized, all members must be initialized. 825 if (!RD->isUnion() || Inits.count(*I)) 826 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 827 } 828} 829 830/// Check the body for the given constexpr function declaration only contains 831/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 832/// 833/// \return true if the body is OK, false if we have diagnosed a problem. 834bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 835 if (isa<CXXTryStmt>(Body)) { 836 // C++0x [dcl.constexpr]p3: 837 // The definition of a constexpr function shall satisfy the following 838 // constraints: [...] 839 // - its function-body shall be = delete, = default, or a 840 // compound-statement 841 // 842 // C++0x [dcl.constexpr]p4: 843 // In the definition of a constexpr constructor, [...] 844 // - its function-body shall not be a function-try-block; 845 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 846 << isa<CXXConstructorDecl>(Dcl); 847 return false; 848 } 849 850 // - its function-body shall be [...] a compound-statement that contains only 851 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 852 853 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 854 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 855 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 856 switch ((*BodyIt)->getStmtClass()) { 857 case Stmt::NullStmtClass: 858 // - null statements, 859 continue; 860 861 case Stmt::DeclStmtClass: 862 // - static_assert-declarations 863 // - using-declarations, 864 // - using-directives, 865 // - typedef declarations and alias-declarations that do not define 866 // classes or enumerations, 867 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 868 return false; 869 continue; 870 871 case Stmt::ReturnStmtClass: 872 // - and exactly one return statement; 873 if (isa<CXXConstructorDecl>(Dcl)) 874 break; 875 876 ReturnStmts.push_back((*BodyIt)->getLocStart()); 877 // FIXME 878 // - every constructor call and implicit conversion used in initializing 879 // the return value shall be one of those allowed in a constant 880 // expression. 881 // Deal with this as part of a general check that the function can produce 882 // a constant expression (for [dcl.constexpr]p5). 883 continue; 884 885 default: 886 break; 887 } 888 889 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 890 << isa<CXXConstructorDecl>(Dcl); 891 return false; 892 } 893 894 if (const CXXConstructorDecl *Constructor 895 = dyn_cast<CXXConstructorDecl>(Dcl)) { 896 const CXXRecordDecl *RD = Constructor->getParent(); 897 // - every non-static data member and base class sub-object shall be 898 // initialized; 899 if (RD->isUnion()) { 900 // DR1359: Exactly one member of a union shall be initialized. 901 if (Constructor->getNumCtorInitializers() == 0) { 902 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 903 return false; 904 } 905 } else if (!Constructor->isDependentContext() && 906 !Constructor->isDelegatingConstructor()) { 907 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 908 909 // Skip detailed checking if we have enough initializers, and we would 910 // allow at most one initializer per member. 911 bool AnyAnonStructUnionMembers = false; 912 unsigned Fields = 0; 913 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 914 E = RD->field_end(); I != E; ++I, ++Fields) { 915 if ((*I)->isAnonymousStructOrUnion()) { 916 AnyAnonStructUnionMembers = true; 917 break; 918 } 919 } 920 if (AnyAnonStructUnionMembers || 921 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 922 // Check initialization of non-static data members. Base classes are 923 // always initialized so do not need to be checked. Dependent bases 924 // might not have initializers in the member initializer list. 925 llvm::SmallSet<Decl*, 16> Inits; 926 for (CXXConstructorDecl::init_const_iterator 927 I = Constructor->init_begin(), E = Constructor->init_end(); 928 I != E; ++I) { 929 if (FieldDecl *FD = (*I)->getMember()) 930 Inits.insert(FD); 931 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 932 Inits.insert(ID->chain_begin(), ID->chain_end()); 933 } 934 935 bool Diagnosed = false; 936 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 937 E = RD->field_end(); I != E; ++I) 938 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 939 if (Diagnosed) 940 return false; 941 } 942 } 943 944 // FIXME 945 // - every constructor involved in initializing non-static data members 946 // and base class sub-objects shall be a constexpr constructor; 947 // - every assignment-expression that is an initializer-clause appearing 948 // directly or indirectly within a brace-or-equal-initializer for 949 // a non-static data member that is not named by a mem-initializer-id 950 // shall be a constant expression; and 951 // - every implicit conversion used in converting a constructor argument 952 // to the corresponding parameter type and converting 953 // a full-expression to the corresponding member type shall be one of 954 // those allowed in a constant expression. 955 // Deal with these as part of a general check that the function can produce 956 // a constant expression (for [dcl.constexpr]p5). 957 } else { 958 if (ReturnStmts.empty()) { 959 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 960 return false; 961 } 962 if (ReturnStmts.size() > 1) { 963 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 964 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 965 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 966 return false; 967 } 968 } 969 970 return true; 971} 972 973/// isCurrentClassName - Determine whether the identifier II is the 974/// name of the class type currently being defined. In the case of 975/// nested classes, this will only return true if II is the name of 976/// the innermost class. 977bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 978 const CXXScopeSpec *SS) { 979 assert(getLangOptions().CPlusPlus && "No class names in C!"); 980 981 CXXRecordDecl *CurDecl; 982 if (SS && SS->isSet() && !SS->isInvalid()) { 983 DeclContext *DC = computeDeclContext(*SS, true); 984 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 985 } else 986 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 987 988 if (CurDecl && CurDecl->getIdentifier()) 989 return &II == CurDecl->getIdentifier(); 990 else 991 return false; 992} 993 994/// \brief Check the validity of a C++ base class specifier. 995/// 996/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 997/// and returns NULL otherwise. 998CXXBaseSpecifier * 999Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1000 SourceRange SpecifierRange, 1001 bool Virtual, AccessSpecifier Access, 1002 TypeSourceInfo *TInfo, 1003 SourceLocation EllipsisLoc) { 1004 QualType BaseType = TInfo->getType(); 1005 1006 // C++ [class.union]p1: 1007 // A union shall not have base classes. 1008 if (Class->isUnion()) { 1009 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1010 << SpecifierRange; 1011 return 0; 1012 } 1013 1014 if (EllipsisLoc.isValid() && 1015 !TInfo->getType()->containsUnexpandedParameterPack()) { 1016 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1017 << TInfo->getTypeLoc().getSourceRange(); 1018 EllipsisLoc = SourceLocation(); 1019 } 1020 1021 if (BaseType->isDependentType()) 1022 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1023 Class->getTagKind() == TTK_Class, 1024 Access, TInfo, EllipsisLoc); 1025 1026 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1027 1028 // Base specifiers must be record types. 1029 if (!BaseType->isRecordType()) { 1030 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1031 return 0; 1032 } 1033 1034 // C++ [class.union]p1: 1035 // A union shall not be used as a base class. 1036 if (BaseType->isUnionType()) { 1037 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1038 return 0; 1039 } 1040 1041 // C++ [class.derived]p2: 1042 // The class-name in a base-specifier shall not be an incompletely 1043 // defined class. 1044 if (RequireCompleteType(BaseLoc, BaseType, 1045 PDiag(diag::err_incomplete_base_class) 1046 << SpecifierRange)) { 1047 Class->setInvalidDecl(); 1048 return 0; 1049 } 1050 1051 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1052 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1053 assert(BaseDecl && "Record type has no declaration"); 1054 BaseDecl = BaseDecl->getDefinition(); 1055 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1056 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1057 assert(CXXBaseDecl && "Base type is not a C++ type"); 1058 1059 // C++ [class]p3: 1060 // If a class is marked final and it appears as a base-type-specifier in 1061 // base-clause, the program is ill-formed. 1062 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1063 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1064 << CXXBaseDecl->getDeclName(); 1065 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1066 << CXXBaseDecl->getDeclName(); 1067 return 0; 1068 } 1069 1070 if (BaseDecl->isInvalidDecl()) 1071 Class->setInvalidDecl(); 1072 1073 // Create the base specifier. 1074 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1075 Class->getTagKind() == TTK_Class, 1076 Access, TInfo, EllipsisLoc); 1077} 1078 1079/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1080/// one entry in the base class list of a class specifier, for 1081/// example: 1082/// class foo : public bar, virtual private baz { 1083/// 'public bar' and 'virtual private baz' are each base-specifiers. 1084BaseResult 1085Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1086 bool Virtual, AccessSpecifier Access, 1087 ParsedType basetype, SourceLocation BaseLoc, 1088 SourceLocation EllipsisLoc) { 1089 if (!classdecl) 1090 return true; 1091 1092 AdjustDeclIfTemplate(classdecl); 1093 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1094 if (!Class) 1095 return true; 1096 1097 TypeSourceInfo *TInfo = 0; 1098 GetTypeFromParser(basetype, &TInfo); 1099 1100 if (EllipsisLoc.isInvalid() && 1101 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1102 UPPC_BaseType)) 1103 return true; 1104 1105 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1106 Virtual, Access, TInfo, 1107 EllipsisLoc)) 1108 return BaseSpec; 1109 1110 return true; 1111} 1112 1113/// \brief Performs the actual work of attaching the given base class 1114/// specifiers to a C++ class. 1115bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1116 unsigned NumBases) { 1117 if (NumBases == 0) 1118 return false; 1119 1120 // Used to keep track of which base types we have already seen, so 1121 // that we can properly diagnose redundant direct base types. Note 1122 // that the key is always the unqualified canonical type of the base 1123 // class. 1124 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1125 1126 // Copy non-redundant base specifiers into permanent storage. 1127 unsigned NumGoodBases = 0; 1128 bool Invalid = false; 1129 for (unsigned idx = 0; idx < NumBases; ++idx) { 1130 QualType NewBaseType 1131 = Context.getCanonicalType(Bases[idx]->getType()); 1132 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1133 if (KnownBaseTypes[NewBaseType]) { 1134 // C++ [class.mi]p3: 1135 // A class shall not be specified as a direct base class of a 1136 // derived class more than once. 1137 Diag(Bases[idx]->getSourceRange().getBegin(), 1138 diag::err_duplicate_base_class) 1139 << KnownBaseTypes[NewBaseType]->getType() 1140 << Bases[idx]->getSourceRange(); 1141 1142 // Delete the duplicate base class specifier; we're going to 1143 // overwrite its pointer later. 1144 Context.Deallocate(Bases[idx]); 1145 1146 Invalid = true; 1147 } else { 1148 // Okay, add this new base class. 1149 KnownBaseTypes[NewBaseType] = Bases[idx]; 1150 Bases[NumGoodBases++] = Bases[idx]; 1151 } 1152 } 1153 1154 // Attach the remaining base class specifiers to the derived class. 1155 Class->setBases(Bases, NumGoodBases); 1156 1157 // Delete the remaining (good) base class specifiers, since their 1158 // data has been copied into the CXXRecordDecl. 1159 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1160 Context.Deallocate(Bases[idx]); 1161 1162 return Invalid; 1163} 1164 1165/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1166/// class, after checking whether there are any duplicate base 1167/// classes. 1168void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1169 unsigned NumBases) { 1170 if (!ClassDecl || !Bases || !NumBases) 1171 return; 1172 1173 AdjustDeclIfTemplate(ClassDecl); 1174 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1175 (CXXBaseSpecifier**)(Bases), NumBases); 1176} 1177 1178static CXXRecordDecl *GetClassForType(QualType T) { 1179 if (const RecordType *RT = T->getAs<RecordType>()) 1180 return cast<CXXRecordDecl>(RT->getDecl()); 1181 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1182 return ICT->getDecl(); 1183 else 1184 return 0; 1185} 1186 1187/// \brief Determine whether the type \p Derived is a C++ class that is 1188/// derived from the type \p Base. 1189bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1190 if (!getLangOptions().CPlusPlus) 1191 return false; 1192 1193 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1194 if (!DerivedRD) 1195 return false; 1196 1197 CXXRecordDecl *BaseRD = GetClassForType(Base); 1198 if (!BaseRD) 1199 return false; 1200 1201 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1202 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1203} 1204 1205/// \brief Determine whether the type \p Derived is a C++ class that is 1206/// derived from the type \p Base. 1207bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1208 if (!getLangOptions().CPlusPlus) 1209 return false; 1210 1211 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1212 if (!DerivedRD) 1213 return false; 1214 1215 CXXRecordDecl *BaseRD = GetClassForType(Base); 1216 if (!BaseRD) 1217 return false; 1218 1219 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1220} 1221 1222void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1223 CXXCastPath &BasePathArray) { 1224 assert(BasePathArray.empty() && "Base path array must be empty!"); 1225 assert(Paths.isRecordingPaths() && "Must record paths!"); 1226 1227 const CXXBasePath &Path = Paths.front(); 1228 1229 // We first go backward and check if we have a virtual base. 1230 // FIXME: It would be better if CXXBasePath had the base specifier for 1231 // the nearest virtual base. 1232 unsigned Start = 0; 1233 for (unsigned I = Path.size(); I != 0; --I) { 1234 if (Path[I - 1].Base->isVirtual()) { 1235 Start = I - 1; 1236 break; 1237 } 1238 } 1239 1240 // Now add all bases. 1241 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1242 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1243} 1244 1245/// \brief Determine whether the given base path includes a virtual 1246/// base class. 1247bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1248 for (CXXCastPath::const_iterator B = BasePath.begin(), 1249 BEnd = BasePath.end(); 1250 B != BEnd; ++B) 1251 if ((*B)->isVirtual()) 1252 return true; 1253 1254 return false; 1255} 1256 1257/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1258/// conversion (where Derived and Base are class types) is 1259/// well-formed, meaning that the conversion is unambiguous (and 1260/// that all of the base classes are accessible). Returns true 1261/// and emits a diagnostic if the code is ill-formed, returns false 1262/// otherwise. Loc is the location where this routine should point to 1263/// if there is an error, and Range is the source range to highlight 1264/// if there is an error. 1265bool 1266Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1267 unsigned InaccessibleBaseID, 1268 unsigned AmbigiousBaseConvID, 1269 SourceLocation Loc, SourceRange Range, 1270 DeclarationName Name, 1271 CXXCastPath *BasePath) { 1272 // First, determine whether the path from Derived to Base is 1273 // ambiguous. This is slightly more expensive than checking whether 1274 // the Derived to Base conversion exists, because here we need to 1275 // explore multiple paths to determine if there is an ambiguity. 1276 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1277 /*DetectVirtual=*/false); 1278 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1279 assert(DerivationOkay && 1280 "Can only be used with a derived-to-base conversion"); 1281 (void)DerivationOkay; 1282 1283 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1284 if (InaccessibleBaseID) { 1285 // Check that the base class can be accessed. 1286 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1287 InaccessibleBaseID)) { 1288 case AR_inaccessible: 1289 return true; 1290 case AR_accessible: 1291 case AR_dependent: 1292 case AR_delayed: 1293 break; 1294 } 1295 } 1296 1297 // Build a base path if necessary. 1298 if (BasePath) 1299 BuildBasePathArray(Paths, *BasePath); 1300 return false; 1301 } 1302 1303 // We know that the derived-to-base conversion is ambiguous, and 1304 // we're going to produce a diagnostic. Perform the derived-to-base 1305 // search just one more time to compute all of the possible paths so 1306 // that we can print them out. This is more expensive than any of 1307 // the previous derived-to-base checks we've done, but at this point 1308 // performance isn't as much of an issue. 1309 Paths.clear(); 1310 Paths.setRecordingPaths(true); 1311 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1312 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1313 (void)StillOkay; 1314 1315 // Build up a textual representation of the ambiguous paths, e.g., 1316 // D -> B -> A, that will be used to illustrate the ambiguous 1317 // conversions in the diagnostic. We only print one of the paths 1318 // to each base class subobject. 1319 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1320 1321 Diag(Loc, AmbigiousBaseConvID) 1322 << Derived << Base << PathDisplayStr << Range << Name; 1323 return true; 1324} 1325 1326bool 1327Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1328 SourceLocation Loc, SourceRange Range, 1329 CXXCastPath *BasePath, 1330 bool IgnoreAccess) { 1331 return CheckDerivedToBaseConversion(Derived, Base, 1332 IgnoreAccess ? 0 1333 : diag::err_upcast_to_inaccessible_base, 1334 diag::err_ambiguous_derived_to_base_conv, 1335 Loc, Range, DeclarationName(), 1336 BasePath); 1337} 1338 1339 1340/// @brief Builds a string representing ambiguous paths from a 1341/// specific derived class to different subobjects of the same base 1342/// class. 1343/// 1344/// This function builds a string that can be used in error messages 1345/// to show the different paths that one can take through the 1346/// inheritance hierarchy to go from the derived class to different 1347/// subobjects of a base class. The result looks something like this: 1348/// @code 1349/// struct D -> struct B -> struct A 1350/// struct D -> struct C -> struct A 1351/// @endcode 1352std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1353 std::string PathDisplayStr; 1354 std::set<unsigned> DisplayedPaths; 1355 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1356 Path != Paths.end(); ++Path) { 1357 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1358 // We haven't displayed a path to this particular base 1359 // class subobject yet. 1360 PathDisplayStr += "\n "; 1361 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1362 for (CXXBasePath::const_iterator Element = Path->begin(); 1363 Element != Path->end(); ++Element) 1364 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1365 } 1366 } 1367 1368 return PathDisplayStr; 1369} 1370 1371//===----------------------------------------------------------------------===// 1372// C++ class member Handling 1373//===----------------------------------------------------------------------===// 1374 1375/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1376Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1377 SourceLocation ASLoc, 1378 SourceLocation ColonLoc) { 1379 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1380 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1381 ASLoc, ColonLoc); 1382 CurContext->addHiddenDecl(ASDecl); 1383 return ASDecl; 1384} 1385 1386/// CheckOverrideControl - Check C++0x override control semantics. 1387void Sema::CheckOverrideControl(const Decl *D) { 1388 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1389 if (!MD || !MD->isVirtual()) 1390 return; 1391 1392 if (MD->isDependentContext()) 1393 return; 1394 1395 // C++0x [class.virtual]p3: 1396 // If a virtual function is marked with the virt-specifier override and does 1397 // not override a member function of a base class, 1398 // the program is ill-formed. 1399 bool HasOverriddenMethods = 1400 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1401 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1402 Diag(MD->getLocation(), 1403 diag::err_function_marked_override_not_overriding) 1404 << MD->getDeclName(); 1405 return; 1406 } 1407} 1408 1409/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1410/// function overrides a virtual member function marked 'final', according to 1411/// C++0x [class.virtual]p3. 1412bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1413 const CXXMethodDecl *Old) { 1414 if (!Old->hasAttr<FinalAttr>()) 1415 return false; 1416 1417 Diag(New->getLocation(), diag::err_final_function_overridden) 1418 << New->getDeclName(); 1419 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1420 return true; 1421} 1422 1423/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1424/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1425/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1426/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1427/// present but parsing it has been deferred. 1428Decl * 1429Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1430 MultiTemplateParamsArg TemplateParameterLists, 1431 Expr *BW, const VirtSpecifiers &VS, 1432 bool HasDeferredInit, 1433 bool IsDefinition) { 1434 const DeclSpec &DS = D.getDeclSpec(); 1435 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1436 DeclarationName Name = NameInfo.getName(); 1437 SourceLocation Loc = NameInfo.getLoc(); 1438 1439 // For anonymous bitfields, the location should point to the type. 1440 if (Loc.isInvalid()) 1441 Loc = D.getSourceRange().getBegin(); 1442 1443 Expr *BitWidth = static_cast<Expr*>(BW); 1444 1445 assert(isa<CXXRecordDecl>(CurContext)); 1446 assert(!DS.isFriendSpecified()); 1447 1448 bool isFunc = D.isDeclarationOfFunction(); 1449 1450 // C++ 9.2p6: A member shall not be declared to have automatic storage 1451 // duration (auto, register) or with the extern storage-class-specifier. 1452 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1453 // data members and cannot be applied to names declared const or static, 1454 // and cannot be applied to reference members. 1455 switch (DS.getStorageClassSpec()) { 1456 case DeclSpec::SCS_unspecified: 1457 case DeclSpec::SCS_typedef: 1458 case DeclSpec::SCS_static: 1459 // FALL THROUGH. 1460 break; 1461 case DeclSpec::SCS_mutable: 1462 if (isFunc) { 1463 if (DS.getStorageClassSpecLoc().isValid()) 1464 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1465 else 1466 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1467 1468 // FIXME: It would be nicer if the keyword was ignored only for this 1469 // declarator. Otherwise we could get follow-up errors. 1470 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1471 } 1472 break; 1473 default: 1474 if (DS.getStorageClassSpecLoc().isValid()) 1475 Diag(DS.getStorageClassSpecLoc(), 1476 diag::err_storageclass_invalid_for_member); 1477 else 1478 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1479 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1480 } 1481 1482 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1483 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1484 !isFunc); 1485 1486 Decl *Member; 1487 if (isInstField) { 1488 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1489 1490 // Data members must have identifiers for names. 1491 if (Name.getNameKind() != DeclarationName::Identifier) { 1492 Diag(Loc, diag::err_bad_variable_name) 1493 << Name; 1494 return 0; 1495 } 1496 1497 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1498 1499 // Member field could not be with "template" keyword. 1500 // So TemplateParameterLists should be empty in this case. 1501 if (TemplateParameterLists.size()) { 1502 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1503 if (TemplateParams->size()) { 1504 // There is no such thing as a member field template. 1505 Diag(D.getIdentifierLoc(), diag::err_template_member) 1506 << II 1507 << SourceRange(TemplateParams->getTemplateLoc(), 1508 TemplateParams->getRAngleLoc()); 1509 } else { 1510 // There is an extraneous 'template<>' for this member. 1511 Diag(TemplateParams->getTemplateLoc(), 1512 diag::err_template_member_noparams) 1513 << II 1514 << SourceRange(TemplateParams->getTemplateLoc(), 1515 TemplateParams->getRAngleLoc()); 1516 } 1517 return 0; 1518 } 1519 1520 if (SS.isSet() && !SS.isInvalid()) { 1521 // The user provided a superfluous scope specifier inside a class 1522 // definition: 1523 // 1524 // class X { 1525 // int X::member; 1526 // }; 1527 DeclContext *DC = 0; 1528 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1529 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1530 << Name << FixItHint::CreateRemoval(SS.getRange()); 1531 else 1532 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1533 << Name << SS.getRange(); 1534 1535 SS.clear(); 1536 } 1537 1538 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1539 HasDeferredInit, AS); 1540 assert(Member && "HandleField never returns null"); 1541 } else { 1542 assert(!HasDeferredInit); 1543 1544 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1545 if (!Member) { 1546 return 0; 1547 } 1548 1549 // Non-instance-fields can't have a bitfield. 1550 if (BitWidth) { 1551 if (Member->isInvalidDecl()) { 1552 // don't emit another diagnostic. 1553 } else if (isa<VarDecl>(Member)) { 1554 // C++ 9.6p3: A bit-field shall not be a static member. 1555 // "static member 'A' cannot be a bit-field" 1556 Diag(Loc, diag::err_static_not_bitfield) 1557 << Name << BitWidth->getSourceRange(); 1558 } else if (isa<TypedefDecl>(Member)) { 1559 // "typedef member 'x' cannot be a bit-field" 1560 Diag(Loc, diag::err_typedef_not_bitfield) 1561 << Name << BitWidth->getSourceRange(); 1562 } else { 1563 // A function typedef ("typedef int f(); f a;"). 1564 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1565 Diag(Loc, diag::err_not_integral_type_bitfield) 1566 << Name << cast<ValueDecl>(Member)->getType() 1567 << BitWidth->getSourceRange(); 1568 } 1569 1570 BitWidth = 0; 1571 Member->setInvalidDecl(); 1572 } 1573 1574 Member->setAccess(AS); 1575 1576 // If we have declared a member function template, set the access of the 1577 // templated declaration as well. 1578 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1579 FunTmpl->getTemplatedDecl()->setAccess(AS); 1580 } 1581 1582 if (VS.isOverrideSpecified()) { 1583 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1584 if (!MD || !MD->isVirtual()) { 1585 Diag(Member->getLocStart(), 1586 diag::override_keyword_only_allowed_on_virtual_member_functions) 1587 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1588 } else 1589 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1590 } 1591 if (VS.isFinalSpecified()) { 1592 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1593 if (!MD || !MD->isVirtual()) { 1594 Diag(Member->getLocStart(), 1595 diag::override_keyword_only_allowed_on_virtual_member_functions) 1596 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1597 } else 1598 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1599 } 1600 1601 if (VS.getLastLocation().isValid()) { 1602 // Update the end location of a method that has a virt-specifiers. 1603 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1604 MD->setRangeEnd(VS.getLastLocation()); 1605 } 1606 1607 CheckOverrideControl(Member); 1608 1609 assert((Name || isInstField) && "No identifier for non-field ?"); 1610 1611 if (isInstField) 1612 FieldCollector->Add(cast<FieldDecl>(Member)); 1613 return Member; 1614} 1615 1616/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1617/// in-class initializer for a non-static C++ class member, and after 1618/// instantiating an in-class initializer in a class template. Such actions 1619/// are deferred until the class is complete. 1620void 1621Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1622 Expr *InitExpr) { 1623 FieldDecl *FD = cast<FieldDecl>(D); 1624 1625 if (!InitExpr) { 1626 FD->setInvalidDecl(); 1627 FD->removeInClassInitializer(); 1628 return; 1629 } 1630 1631 ExprResult Init = InitExpr; 1632 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1633 // FIXME: if there is no EqualLoc, this is list-initialization. 1634 Init = PerformCopyInitialization( 1635 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1636 if (Init.isInvalid()) { 1637 FD->setInvalidDecl(); 1638 return; 1639 } 1640 1641 CheckImplicitConversions(Init.get(), EqualLoc); 1642 } 1643 1644 // C++0x [class.base.init]p7: 1645 // The initialization of each base and member constitutes a 1646 // full-expression. 1647 Init = MaybeCreateExprWithCleanups(Init); 1648 if (Init.isInvalid()) { 1649 FD->setInvalidDecl(); 1650 return; 1651 } 1652 1653 InitExpr = Init.release(); 1654 1655 FD->setInClassInitializer(InitExpr); 1656} 1657 1658/// \brief Find the direct and/or virtual base specifiers that 1659/// correspond to the given base type, for use in base initialization 1660/// within a constructor. 1661static bool FindBaseInitializer(Sema &SemaRef, 1662 CXXRecordDecl *ClassDecl, 1663 QualType BaseType, 1664 const CXXBaseSpecifier *&DirectBaseSpec, 1665 const CXXBaseSpecifier *&VirtualBaseSpec) { 1666 // First, check for a direct base class. 1667 DirectBaseSpec = 0; 1668 for (CXXRecordDecl::base_class_const_iterator Base 1669 = ClassDecl->bases_begin(); 1670 Base != ClassDecl->bases_end(); ++Base) { 1671 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1672 // We found a direct base of this type. That's what we're 1673 // initializing. 1674 DirectBaseSpec = &*Base; 1675 break; 1676 } 1677 } 1678 1679 // Check for a virtual base class. 1680 // FIXME: We might be able to short-circuit this if we know in advance that 1681 // there are no virtual bases. 1682 VirtualBaseSpec = 0; 1683 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1684 // We haven't found a base yet; search the class hierarchy for a 1685 // virtual base class. 1686 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1687 /*DetectVirtual=*/false); 1688 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1689 BaseType, Paths)) { 1690 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1691 Path != Paths.end(); ++Path) { 1692 if (Path->back().Base->isVirtual()) { 1693 VirtualBaseSpec = Path->back().Base; 1694 break; 1695 } 1696 } 1697 } 1698 } 1699 1700 return DirectBaseSpec || VirtualBaseSpec; 1701} 1702 1703/// \brief Handle a C++ member initializer using braced-init-list syntax. 1704MemInitResult 1705Sema::ActOnMemInitializer(Decl *ConstructorD, 1706 Scope *S, 1707 CXXScopeSpec &SS, 1708 IdentifierInfo *MemberOrBase, 1709 ParsedType TemplateTypeTy, 1710 SourceLocation IdLoc, 1711 Expr *InitList, 1712 SourceLocation EllipsisLoc) { 1713 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1714 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1715} 1716 1717/// \brief Handle a C++ member initializer using parentheses syntax. 1718MemInitResult 1719Sema::ActOnMemInitializer(Decl *ConstructorD, 1720 Scope *S, 1721 CXXScopeSpec &SS, 1722 IdentifierInfo *MemberOrBase, 1723 ParsedType TemplateTypeTy, 1724 SourceLocation IdLoc, 1725 SourceLocation LParenLoc, 1726 Expr **Args, unsigned NumArgs, 1727 SourceLocation RParenLoc, 1728 SourceLocation EllipsisLoc) { 1729 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1730 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1731 RParenLoc), 1732 EllipsisLoc); 1733} 1734 1735/// \brief Handle a C++ member initializer. 1736MemInitResult 1737Sema::BuildMemInitializer(Decl *ConstructorD, 1738 Scope *S, 1739 CXXScopeSpec &SS, 1740 IdentifierInfo *MemberOrBase, 1741 ParsedType TemplateTypeTy, 1742 SourceLocation IdLoc, 1743 const MultiInitializer &Args, 1744 SourceLocation EllipsisLoc) { 1745 if (!ConstructorD) 1746 return true; 1747 1748 AdjustDeclIfTemplate(ConstructorD); 1749 1750 CXXConstructorDecl *Constructor 1751 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1752 if (!Constructor) { 1753 // The user wrote a constructor initializer on a function that is 1754 // not a C++ constructor. Ignore the error for now, because we may 1755 // have more member initializers coming; we'll diagnose it just 1756 // once in ActOnMemInitializers. 1757 return true; 1758 } 1759 1760 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1761 1762 // C++ [class.base.init]p2: 1763 // Names in a mem-initializer-id are looked up in the scope of the 1764 // constructor's class and, if not found in that scope, are looked 1765 // up in the scope containing the constructor's definition. 1766 // [Note: if the constructor's class contains a member with the 1767 // same name as a direct or virtual base class of the class, a 1768 // mem-initializer-id naming the member or base class and composed 1769 // of a single identifier refers to the class member. A 1770 // mem-initializer-id for the hidden base class may be specified 1771 // using a qualified name. ] 1772 if (!SS.getScopeRep() && !TemplateTypeTy) { 1773 // Look for a member, first. 1774 FieldDecl *Member = 0; 1775 DeclContext::lookup_result Result 1776 = ClassDecl->lookup(MemberOrBase); 1777 if (Result.first != Result.second) { 1778 Member = dyn_cast<FieldDecl>(*Result.first); 1779 1780 if (Member) { 1781 if (EllipsisLoc.isValid()) 1782 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1783 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1784 1785 return BuildMemberInitializer(Member, Args, IdLoc); 1786 } 1787 1788 // Handle anonymous union case. 1789 if (IndirectFieldDecl* IndirectField 1790 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1791 if (EllipsisLoc.isValid()) 1792 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1793 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1794 1795 return BuildMemberInitializer(IndirectField, Args, IdLoc); 1796 } 1797 } 1798 } 1799 // It didn't name a member, so see if it names a class. 1800 QualType BaseType; 1801 TypeSourceInfo *TInfo = 0; 1802 1803 if (TemplateTypeTy) { 1804 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1805 } else { 1806 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1807 LookupParsedName(R, S, &SS); 1808 1809 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1810 if (!TyD) { 1811 if (R.isAmbiguous()) return true; 1812 1813 // We don't want access-control diagnostics here. 1814 R.suppressDiagnostics(); 1815 1816 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1817 bool NotUnknownSpecialization = false; 1818 DeclContext *DC = computeDeclContext(SS, false); 1819 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1820 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1821 1822 if (!NotUnknownSpecialization) { 1823 // When the scope specifier can refer to a member of an unknown 1824 // specialization, we take it as a type name. 1825 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1826 SS.getWithLocInContext(Context), 1827 *MemberOrBase, IdLoc); 1828 if (BaseType.isNull()) 1829 return true; 1830 1831 R.clear(); 1832 R.setLookupName(MemberOrBase); 1833 } 1834 } 1835 1836 // If no results were found, try to correct typos. 1837 TypoCorrection Corr; 1838 if (R.empty() && BaseType.isNull() && 1839 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1840 ClassDecl, false, CTC_NoKeywords))) { 1841 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1842 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1843 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1844 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1845 // We have found a non-static data member with a similar 1846 // name to what was typed; complain and initialize that 1847 // member. 1848 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1849 << MemberOrBase << true << CorrectedQuotedStr 1850 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1851 Diag(Member->getLocation(), diag::note_previous_decl) 1852 << CorrectedQuotedStr; 1853 1854 return BuildMemberInitializer(Member, Args, IdLoc); 1855 } 1856 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1857 const CXXBaseSpecifier *DirectBaseSpec; 1858 const CXXBaseSpecifier *VirtualBaseSpec; 1859 if (FindBaseInitializer(*this, ClassDecl, 1860 Context.getTypeDeclType(Type), 1861 DirectBaseSpec, VirtualBaseSpec)) { 1862 // We have found a direct or virtual base class with a 1863 // similar name to what was typed; complain and initialize 1864 // that base class. 1865 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1866 << MemberOrBase << false << CorrectedQuotedStr 1867 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1868 1869 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1870 : VirtualBaseSpec; 1871 Diag(BaseSpec->getSourceRange().getBegin(), 1872 diag::note_base_class_specified_here) 1873 << BaseSpec->getType() 1874 << BaseSpec->getSourceRange(); 1875 1876 TyD = Type; 1877 } 1878 } 1879 } 1880 1881 if (!TyD && BaseType.isNull()) { 1882 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1883 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1884 return true; 1885 } 1886 } 1887 1888 if (BaseType.isNull()) { 1889 BaseType = Context.getTypeDeclType(TyD); 1890 if (SS.isSet()) { 1891 NestedNameSpecifier *Qualifier = 1892 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1893 1894 // FIXME: preserve source range information 1895 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1896 } 1897 } 1898 } 1899 1900 if (!TInfo) 1901 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1902 1903 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1904} 1905 1906/// Checks a member initializer expression for cases where reference (or 1907/// pointer) members are bound to by-value parameters (or their addresses). 1908static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1909 Expr *Init, 1910 SourceLocation IdLoc) { 1911 QualType MemberTy = Member->getType(); 1912 1913 // We only handle pointers and references currently. 1914 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1915 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1916 return; 1917 1918 const bool IsPointer = MemberTy->isPointerType(); 1919 if (IsPointer) { 1920 if (const UnaryOperator *Op 1921 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1922 // The only case we're worried about with pointers requires taking the 1923 // address. 1924 if (Op->getOpcode() != UO_AddrOf) 1925 return; 1926 1927 Init = Op->getSubExpr(); 1928 } else { 1929 // We only handle address-of expression initializers for pointers. 1930 return; 1931 } 1932 } 1933 1934 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1935 // Taking the address of a temporary will be diagnosed as a hard error. 1936 if (IsPointer) 1937 return; 1938 1939 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1940 << Member << Init->getSourceRange(); 1941 } else if (const DeclRefExpr *DRE 1942 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1943 // We only warn when referring to a non-reference parameter declaration. 1944 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1945 if (!Parameter || Parameter->getType()->isReferenceType()) 1946 return; 1947 1948 S.Diag(Init->getExprLoc(), 1949 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1950 : diag::warn_bind_ref_member_to_parameter) 1951 << Member << Parameter << Init->getSourceRange(); 1952 } else { 1953 // Other initializers are fine. 1954 return; 1955 } 1956 1957 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1958 << (unsigned)IsPointer; 1959} 1960 1961/// Checks an initializer expression for use of uninitialized fields, such as 1962/// containing the field that is being initialized. Returns true if there is an 1963/// uninitialized field was used an updates the SourceLocation parameter; false 1964/// otherwise. 1965static bool InitExprContainsUninitializedFields(const Stmt *S, 1966 const ValueDecl *LhsField, 1967 SourceLocation *L) { 1968 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1969 1970 if (isa<CallExpr>(S)) { 1971 // Do not descend into function calls or constructors, as the use 1972 // of an uninitialized field may be valid. One would have to inspect 1973 // the contents of the function/ctor to determine if it is safe or not. 1974 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1975 // may be safe, depending on what the function/ctor does. 1976 return false; 1977 } 1978 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1979 const NamedDecl *RhsField = ME->getMemberDecl(); 1980 1981 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1982 // The member expression points to a static data member. 1983 assert(VD->isStaticDataMember() && 1984 "Member points to non-static data member!"); 1985 (void)VD; 1986 return false; 1987 } 1988 1989 if (isa<EnumConstantDecl>(RhsField)) { 1990 // The member expression points to an enum. 1991 return false; 1992 } 1993 1994 if (RhsField == LhsField) { 1995 // Initializing a field with itself. Throw a warning. 1996 // But wait; there are exceptions! 1997 // Exception #1: The field may not belong to this record. 1998 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1999 const Expr *base = ME->getBase(); 2000 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2001 // Even though the field matches, it does not belong to this record. 2002 return false; 2003 } 2004 // None of the exceptions triggered; return true to indicate an 2005 // uninitialized field was used. 2006 *L = ME->getMemberLoc(); 2007 return true; 2008 } 2009 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2010 // sizeof/alignof doesn't reference contents, do not warn. 2011 return false; 2012 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2013 // address-of doesn't reference contents (the pointer may be dereferenced 2014 // in the same expression but it would be rare; and weird). 2015 if (UOE->getOpcode() == UO_AddrOf) 2016 return false; 2017 } 2018 for (Stmt::const_child_range it = S->children(); it; ++it) { 2019 if (!*it) { 2020 // An expression such as 'member(arg ?: "")' may trigger this. 2021 continue; 2022 } 2023 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2024 return true; 2025 } 2026 return false; 2027} 2028 2029MemInitResult 2030Sema::BuildMemberInitializer(ValueDecl *Member, 2031 const MultiInitializer &Args, 2032 SourceLocation IdLoc) { 2033 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2034 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2035 assert((DirectMember || IndirectMember) && 2036 "Member must be a FieldDecl or IndirectFieldDecl"); 2037 2038 if (Member->isInvalidDecl()) 2039 return true; 2040 2041 // Diagnose value-uses of fields to initialize themselves, e.g. 2042 // foo(foo) 2043 // where foo is not also a parameter to the constructor. 2044 // TODO: implement -Wuninitialized and fold this into that framework. 2045 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2046 I != E; ++I) { 2047 SourceLocation L; 2048 Expr *Arg = *I; 2049 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2050 Arg = DIE->getInit(); 2051 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2052 // FIXME: Return true in the case when other fields are used before being 2053 // uninitialized. For example, let this field be the i'th field. When 2054 // initializing the i'th field, throw a warning if any of the >= i'th 2055 // fields are used, as they are not yet initialized. 2056 // Right now we are only handling the case where the i'th field uses 2057 // itself in its initializer. 2058 Diag(L, diag::warn_field_is_uninit); 2059 } 2060 } 2061 2062 bool HasDependentArg = Args.isTypeDependent(); 2063 2064 Expr *Init; 2065 if (Member->getType()->isDependentType() || HasDependentArg) { 2066 // Can't check initialization for a member of dependent type or when 2067 // any of the arguments are type-dependent expressions. 2068 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2069 2070 DiscardCleanupsInEvaluationContext(); 2071 } else { 2072 // Initialize the member. 2073 InitializedEntity MemberEntity = 2074 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2075 : InitializedEntity::InitializeMember(IndirectMember, 0); 2076 InitializationKind Kind = 2077 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2078 Args.getEndLoc()); 2079 2080 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2081 if (MemberInit.isInvalid()) 2082 return true; 2083 2084 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2085 2086 // C++0x [class.base.init]p7: 2087 // The initialization of each base and member constitutes a 2088 // full-expression. 2089 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2090 if (MemberInit.isInvalid()) 2091 return true; 2092 2093 // If we are in a dependent context, template instantiation will 2094 // perform this type-checking again. Just save the arguments that we 2095 // received in a ParenListExpr. 2096 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2097 // of the information that we have about the member 2098 // initializer. However, deconstructing the ASTs is a dicey process, 2099 // and this approach is far more likely to get the corner cases right. 2100 if (CurContext->isDependentContext()) { 2101 Init = Args.CreateInitExpr(Context, 2102 Member->getType().getNonReferenceType()); 2103 } else { 2104 Init = MemberInit.get(); 2105 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2106 } 2107 } 2108 2109 if (DirectMember) { 2110 return new (Context) CXXCtorInitializer(Context, DirectMember, 2111 IdLoc, Args.getStartLoc(), 2112 Init, Args.getEndLoc()); 2113 } else { 2114 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2115 IdLoc, Args.getStartLoc(), 2116 Init, Args.getEndLoc()); 2117 } 2118} 2119 2120MemInitResult 2121Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2122 const MultiInitializer &Args, 2123 SourceLocation NameLoc, 2124 CXXRecordDecl *ClassDecl) { 2125 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2126 if (!LangOpts.CPlusPlus0x) 2127 return Diag(Loc, diag::err_delegation_0x_only) 2128 << TInfo->getTypeLoc().getLocalSourceRange(); 2129 2130 // Initialize the object. 2131 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2132 QualType(ClassDecl->getTypeForDecl(), 0)); 2133 InitializationKind Kind = 2134 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2135 Args.getEndLoc()); 2136 2137 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2138 if (DelegationInit.isInvalid()) 2139 return true; 2140 2141 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 2142 CXXConstructorDecl *Constructor 2143 = ConExpr->getConstructor(); 2144 assert(Constructor && "Delegating constructor with no target?"); 2145 2146 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2147 2148 // C++0x [class.base.init]p7: 2149 // The initialization of each base and member constitutes a 2150 // full-expression. 2151 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2152 if (DelegationInit.isInvalid()) 2153 return true; 2154 2155 assert(!CurContext->isDependentContext()); 2156 return new (Context) CXXCtorInitializer(Context, Loc, Args.getStartLoc(), 2157 Constructor, 2158 DelegationInit.takeAs<Expr>(), 2159 Args.getEndLoc()); 2160} 2161 2162MemInitResult 2163Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2164 const MultiInitializer &Args, 2165 CXXRecordDecl *ClassDecl, 2166 SourceLocation EllipsisLoc) { 2167 bool HasDependentArg = Args.isTypeDependent(); 2168 2169 SourceLocation BaseLoc 2170 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2171 2172 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2173 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2174 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2175 2176 // C++ [class.base.init]p2: 2177 // [...] Unless the mem-initializer-id names a nonstatic data 2178 // member of the constructor's class or a direct or virtual base 2179 // of that class, the mem-initializer is ill-formed. A 2180 // mem-initializer-list can initialize a base class using any 2181 // name that denotes that base class type. 2182 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2183 2184 if (EllipsisLoc.isValid()) { 2185 // This is a pack expansion. 2186 if (!BaseType->containsUnexpandedParameterPack()) { 2187 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2188 << SourceRange(BaseLoc, Args.getEndLoc()); 2189 2190 EllipsisLoc = SourceLocation(); 2191 } 2192 } else { 2193 // Check for any unexpanded parameter packs. 2194 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2195 return true; 2196 2197 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2198 return true; 2199 } 2200 2201 // Check for direct and virtual base classes. 2202 const CXXBaseSpecifier *DirectBaseSpec = 0; 2203 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2204 if (!Dependent) { 2205 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2206 BaseType)) 2207 return BuildDelegatingInitializer(BaseTInfo, Args, BaseLoc, ClassDecl); 2208 2209 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2210 VirtualBaseSpec); 2211 2212 // C++ [base.class.init]p2: 2213 // Unless the mem-initializer-id names a nonstatic data member of the 2214 // constructor's class or a direct or virtual base of that class, the 2215 // mem-initializer is ill-formed. 2216 if (!DirectBaseSpec && !VirtualBaseSpec) { 2217 // If the class has any dependent bases, then it's possible that 2218 // one of those types will resolve to the same type as 2219 // BaseType. Therefore, just treat this as a dependent base 2220 // class initialization. FIXME: Should we try to check the 2221 // initialization anyway? It seems odd. 2222 if (ClassDecl->hasAnyDependentBases()) 2223 Dependent = true; 2224 else 2225 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2226 << BaseType << Context.getTypeDeclType(ClassDecl) 2227 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2228 } 2229 } 2230 2231 if (Dependent) { 2232 // Can't check initialization for a base of dependent type or when 2233 // any of the arguments are type-dependent expressions. 2234 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2235 2236 DiscardCleanupsInEvaluationContext(); 2237 2238 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2239 /*IsVirtual=*/false, 2240 Args.getStartLoc(), BaseInit, 2241 Args.getEndLoc(), EllipsisLoc); 2242 } 2243 2244 // C++ [base.class.init]p2: 2245 // If a mem-initializer-id is ambiguous because it designates both 2246 // a direct non-virtual base class and an inherited virtual base 2247 // class, the mem-initializer is ill-formed. 2248 if (DirectBaseSpec && VirtualBaseSpec) 2249 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2250 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2251 2252 CXXBaseSpecifier *BaseSpec 2253 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2254 if (!BaseSpec) 2255 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2256 2257 // Initialize the base. 2258 InitializedEntity BaseEntity = 2259 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2260 InitializationKind Kind = 2261 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2262 Args.getEndLoc()); 2263 2264 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2265 if (BaseInit.isInvalid()) 2266 return true; 2267 2268 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2269 2270 // C++0x [class.base.init]p7: 2271 // The initialization of each base and member constitutes a 2272 // full-expression. 2273 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2274 if (BaseInit.isInvalid()) 2275 return true; 2276 2277 // If we are in a dependent context, template instantiation will 2278 // perform this type-checking again. Just save the arguments that we 2279 // received in a ParenListExpr. 2280 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2281 // of the information that we have about the base 2282 // initializer. However, deconstructing the ASTs is a dicey process, 2283 // and this approach is far more likely to get the corner cases right. 2284 if (CurContext->isDependentContext()) 2285 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2286 2287 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2288 BaseSpec->isVirtual(), 2289 Args.getStartLoc(), 2290 BaseInit.takeAs<Expr>(), 2291 Args.getEndLoc(), EllipsisLoc); 2292} 2293 2294// Create a static_cast\<T&&>(expr). 2295static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2296 QualType ExprType = E->getType(); 2297 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2298 SourceLocation ExprLoc = E->getLocStart(); 2299 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2300 TargetType, ExprLoc); 2301 2302 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2303 SourceRange(ExprLoc, ExprLoc), 2304 E->getSourceRange()).take(); 2305} 2306 2307/// ImplicitInitializerKind - How an implicit base or member initializer should 2308/// initialize its base or member. 2309enum ImplicitInitializerKind { 2310 IIK_Default, 2311 IIK_Copy, 2312 IIK_Move 2313}; 2314 2315static bool 2316BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2317 ImplicitInitializerKind ImplicitInitKind, 2318 CXXBaseSpecifier *BaseSpec, 2319 bool IsInheritedVirtualBase, 2320 CXXCtorInitializer *&CXXBaseInit) { 2321 InitializedEntity InitEntity 2322 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2323 IsInheritedVirtualBase); 2324 2325 ExprResult BaseInit; 2326 2327 switch (ImplicitInitKind) { 2328 case IIK_Default: { 2329 InitializationKind InitKind 2330 = InitializationKind::CreateDefault(Constructor->getLocation()); 2331 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2332 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2333 MultiExprArg(SemaRef, 0, 0)); 2334 break; 2335 } 2336 2337 case IIK_Move: 2338 case IIK_Copy: { 2339 bool Moving = ImplicitInitKind == IIK_Move; 2340 ParmVarDecl *Param = Constructor->getParamDecl(0); 2341 QualType ParamType = Param->getType().getNonReferenceType(); 2342 2343 Expr *CopyCtorArg = 2344 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2345 Constructor->getLocation(), ParamType, 2346 VK_LValue, 0); 2347 2348 // Cast to the base class to avoid ambiguities. 2349 QualType ArgTy = 2350 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2351 ParamType.getQualifiers()); 2352 2353 if (Moving) { 2354 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2355 } 2356 2357 CXXCastPath BasePath; 2358 BasePath.push_back(BaseSpec); 2359 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2360 CK_UncheckedDerivedToBase, 2361 Moving ? VK_XValue : VK_LValue, 2362 &BasePath).take(); 2363 2364 InitializationKind InitKind 2365 = InitializationKind::CreateDirect(Constructor->getLocation(), 2366 SourceLocation(), SourceLocation()); 2367 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2368 &CopyCtorArg, 1); 2369 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2370 MultiExprArg(&CopyCtorArg, 1)); 2371 break; 2372 } 2373 } 2374 2375 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2376 if (BaseInit.isInvalid()) 2377 return true; 2378 2379 CXXBaseInit = 2380 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2381 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2382 SourceLocation()), 2383 BaseSpec->isVirtual(), 2384 SourceLocation(), 2385 BaseInit.takeAs<Expr>(), 2386 SourceLocation(), 2387 SourceLocation()); 2388 2389 return false; 2390} 2391 2392static bool RefersToRValueRef(Expr *MemRef) { 2393 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2394 return Referenced->getType()->isRValueReferenceType(); 2395} 2396 2397static bool 2398BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2399 ImplicitInitializerKind ImplicitInitKind, 2400 FieldDecl *Field, IndirectFieldDecl *Indirect, 2401 CXXCtorInitializer *&CXXMemberInit) { 2402 if (Field->isInvalidDecl()) 2403 return true; 2404 2405 SourceLocation Loc = Constructor->getLocation(); 2406 2407 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2408 bool Moving = ImplicitInitKind == IIK_Move; 2409 ParmVarDecl *Param = Constructor->getParamDecl(0); 2410 QualType ParamType = Param->getType().getNonReferenceType(); 2411 2412 // Suppress copying zero-width bitfields. 2413 if (const Expr *Width = Field->getBitWidth()) 2414 if (Width->EvaluateAsInt(SemaRef.Context) == 0) 2415 return false; 2416 2417 Expr *MemberExprBase = 2418 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2419 Loc, ParamType, VK_LValue, 0); 2420 2421 if (Moving) { 2422 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2423 } 2424 2425 // Build a reference to this field within the parameter. 2426 CXXScopeSpec SS; 2427 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2428 Sema::LookupMemberName); 2429 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2430 : cast<ValueDecl>(Field), AS_public); 2431 MemberLookup.resolveKind(); 2432 ExprResult CtorArg 2433 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2434 ParamType, Loc, 2435 /*IsArrow=*/false, 2436 SS, 2437 /*FirstQualifierInScope=*/0, 2438 MemberLookup, 2439 /*TemplateArgs=*/0); 2440 if (CtorArg.isInvalid()) 2441 return true; 2442 2443 // C++11 [class.copy]p15: 2444 // - if a member m has rvalue reference type T&&, it is direct-initialized 2445 // with static_cast<T&&>(x.m); 2446 if (RefersToRValueRef(CtorArg.get())) { 2447 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2448 } 2449 2450 // When the field we are copying is an array, create index variables for 2451 // each dimension of the array. We use these index variables to subscript 2452 // the source array, and other clients (e.g., CodeGen) will perform the 2453 // necessary iteration with these index variables. 2454 SmallVector<VarDecl *, 4> IndexVariables; 2455 QualType BaseType = Field->getType(); 2456 QualType SizeType = SemaRef.Context.getSizeType(); 2457 bool InitializingArray = false; 2458 while (const ConstantArrayType *Array 2459 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2460 InitializingArray = true; 2461 // Create the iteration variable for this array index. 2462 IdentifierInfo *IterationVarName = 0; 2463 { 2464 llvm::SmallString<8> Str; 2465 llvm::raw_svector_ostream OS(Str); 2466 OS << "__i" << IndexVariables.size(); 2467 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2468 } 2469 VarDecl *IterationVar 2470 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2471 IterationVarName, SizeType, 2472 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2473 SC_None, SC_None); 2474 IndexVariables.push_back(IterationVar); 2475 2476 // Create a reference to the iteration variable. 2477 ExprResult IterationVarRef 2478 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2479 assert(!IterationVarRef.isInvalid() && 2480 "Reference to invented variable cannot fail!"); 2481 2482 // Subscript the array with this iteration variable. 2483 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2484 IterationVarRef.take(), 2485 Loc); 2486 if (CtorArg.isInvalid()) 2487 return true; 2488 2489 BaseType = Array->getElementType(); 2490 } 2491 2492 // The array subscript expression is an lvalue, which is wrong for moving. 2493 if (Moving && InitializingArray) 2494 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2495 2496 // Construct the entity that we will be initializing. For an array, this 2497 // will be first element in the array, which may require several levels 2498 // of array-subscript entities. 2499 SmallVector<InitializedEntity, 4> Entities; 2500 Entities.reserve(1 + IndexVariables.size()); 2501 if (Indirect) 2502 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2503 else 2504 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2505 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2506 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2507 0, 2508 Entities.back())); 2509 2510 // Direct-initialize to use the copy constructor. 2511 InitializationKind InitKind = 2512 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2513 2514 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2515 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2516 &CtorArgE, 1); 2517 2518 ExprResult MemberInit 2519 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2520 MultiExprArg(&CtorArgE, 1)); 2521 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2522 if (MemberInit.isInvalid()) 2523 return true; 2524 2525 if (Indirect) { 2526 assert(IndexVariables.size() == 0 && 2527 "Indirect field improperly initialized"); 2528 CXXMemberInit 2529 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2530 Loc, Loc, 2531 MemberInit.takeAs<Expr>(), 2532 Loc); 2533 } else 2534 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2535 Loc, MemberInit.takeAs<Expr>(), 2536 Loc, 2537 IndexVariables.data(), 2538 IndexVariables.size()); 2539 return false; 2540 } 2541 2542 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2543 2544 QualType FieldBaseElementType = 2545 SemaRef.Context.getBaseElementType(Field->getType()); 2546 2547 if (FieldBaseElementType->isRecordType()) { 2548 InitializedEntity InitEntity 2549 = Indirect? InitializedEntity::InitializeMember(Indirect) 2550 : InitializedEntity::InitializeMember(Field); 2551 InitializationKind InitKind = 2552 InitializationKind::CreateDefault(Loc); 2553 2554 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2555 ExprResult MemberInit = 2556 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2557 2558 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2559 if (MemberInit.isInvalid()) 2560 return true; 2561 2562 if (Indirect) 2563 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2564 Indirect, Loc, 2565 Loc, 2566 MemberInit.get(), 2567 Loc); 2568 else 2569 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2570 Field, Loc, Loc, 2571 MemberInit.get(), 2572 Loc); 2573 return false; 2574 } 2575 2576 if (!Field->getParent()->isUnion()) { 2577 if (FieldBaseElementType->isReferenceType()) { 2578 SemaRef.Diag(Constructor->getLocation(), 2579 diag::err_uninitialized_member_in_ctor) 2580 << (int)Constructor->isImplicit() 2581 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2582 << 0 << Field->getDeclName(); 2583 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2584 return true; 2585 } 2586 2587 if (FieldBaseElementType.isConstQualified()) { 2588 SemaRef.Diag(Constructor->getLocation(), 2589 diag::err_uninitialized_member_in_ctor) 2590 << (int)Constructor->isImplicit() 2591 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2592 << 1 << Field->getDeclName(); 2593 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2594 return true; 2595 } 2596 } 2597 2598 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2599 FieldBaseElementType->isObjCRetainableType() && 2600 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2601 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2602 // Instant objects: 2603 // Default-initialize Objective-C pointers to NULL. 2604 CXXMemberInit 2605 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2606 Loc, Loc, 2607 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2608 Loc); 2609 return false; 2610 } 2611 2612 // Nothing to initialize. 2613 CXXMemberInit = 0; 2614 return false; 2615} 2616 2617namespace { 2618struct BaseAndFieldInfo { 2619 Sema &S; 2620 CXXConstructorDecl *Ctor; 2621 bool AnyErrorsInInits; 2622 ImplicitInitializerKind IIK; 2623 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2624 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2625 2626 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2627 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2628 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2629 if (Generated && Ctor->isCopyConstructor()) 2630 IIK = IIK_Copy; 2631 else if (Generated && Ctor->isMoveConstructor()) 2632 IIK = IIK_Move; 2633 else 2634 IIK = IIK_Default; 2635 } 2636}; 2637} 2638 2639/// \brief Determine whether the given indirect field declaration is somewhere 2640/// within an anonymous union. 2641static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2642 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2643 CEnd = F->chain_end(); 2644 C != CEnd; ++C) 2645 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2646 if (Record->isUnion()) 2647 return true; 2648 2649 return false; 2650} 2651 2652static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2653 FieldDecl *Field, 2654 IndirectFieldDecl *Indirect = 0) { 2655 2656 // Overwhelmingly common case: we have a direct initializer for this field. 2657 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2658 Info.AllToInit.push_back(Init); 2659 return false; 2660 } 2661 2662 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2663 // has a brace-or-equal-initializer, the entity is initialized as specified 2664 // in [dcl.init]. 2665 if (Field->hasInClassInitializer()) { 2666 CXXCtorInitializer *Init; 2667 if (Indirect) 2668 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2669 SourceLocation(), 2670 SourceLocation(), 0, 2671 SourceLocation()); 2672 else 2673 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2674 SourceLocation(), 2675 SourceLocation(), 0, 2676 SourceLocation()); 2677 Info.AllToInit.push_back(Init); 2678 return false; 2679 } 2680 2681 // Don't build an implicit initializer for union members if none was 2682 // explicitly specified. 2683 if (Field->getParent()->isUnion() || 2684 (Indirect && isWithinAnonymousUnion(Indirect))) 2685 return false; 2686 2687 // Don't try to build an implicit initializer if there were semantic 2688 // errors in any of the initializers (and therefore we might be 2689 // missing some that the user actually wrote). 2690 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2691 return false; 2692 2693 CXXCtorInitializer *Init = 0; 2694 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2695 Indirect, Init)) 2696 return true; 2697 2698 if (Init) 2699 Info.AllToInit.push_back(Init); 2700 2701 return false; 2702} 2703 2704bool 2705Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2706 CXXCtorInitializer *Initializer) { 2707 assert(Initializer->isDelegatingInitializer()); 2708 Constructor->setNumCtorInitializers(1); 2709 CXXCtorInitializer **initializer = 2710 new (Context) CXXCtorInitializer*[1]; 2711 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2712 Constructor->setCtorInitializers(initializer); 2713 2714 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2715 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2716 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2717 } 2718 2719 DelegatingCtorDecls.push_back(Constructor); 2720 2721 return false; 2722} 2723 2724bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2725 CXXCtorInitializer **Initializers, 2726 unsigned NumInitializers, 2727 bool AnyErrors) { 2728 if (Constructor->isDependentContext()) { 2729 // Just store the initializers as written, they will be checked during 2730 // instantiation. 2731 if (NumInitializers > 0) { 2732 Constructor->setNumCtorInitializers(NumInitializers); 2733 CXXCtorInitializer **baseOrMemberInitializers = 2734 new (Context) CXXCtorInitializer*[NumInitializers]; 2735 memcpy(baseOrMemberInitializers, Initializers, 2736 NumInitializers * sizeof(CXXCtorInitializer*)); 2737 Constructor->setCtorInitializers(baseOrMemberInitializers); 2738 } 2739 2740 return false; 2741 } 2742 2743 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2744 2745 // We need to build the initializer AST according to order of construction 2746 // and not what user specified in the Initializers list. 2747 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2748 if (!ClassDecl) 2749 return true; 2750 2751 bool HadError = false; 2752 2753 for (unsigned i = 0; i < NumInitializers; i++) { 2754 CXXCtorInitializer *Member = Initializers[i]; 2755 2756 if (Member->isBaseInitializer()) 2757 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2758 else 2759 Info.AllBaseFields[Member->getAnyMember()] = Member; 2760 } 2761 2762 // Keep track of the direct virtual bases. 2763 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2764 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2765 E = ClassDecl->bases_end(); I != E; ++I) { 2766 if (I->isVirtual()) 2767 DirectVBases.insert(I); 2768 } 2769 2770 // Push virtual bases before others. 2771 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2772 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2773 2774 if (CXXCtorInitializer *Value 2775 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2776 Info.AllToInit.push_back(Value); 2777 } else if (!AnyErrors) { 2778 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2779 CXXCtorInitializer *CXXBaseInit; 2780 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2781 VBase, IsInheritedVirtualBase, 2782 CXXBaseInit)) { 2783 HadError = true; 2784 continue; 2785 } 2786 2787 Info.AllToInit.push_back(CXXBaseInit); 2788 } 2789 } 2790 2791 // Non-virtual bases. 2792 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2793 E = ClassDecl->bases_end(); Base != E; ++Base) { 2794 // Virtuals are in the virtual base list and already constructed. 2795 if (Base->isVirtual()) 2796 continue; 2797 2798 if (CXXCtorInitializer *Value 2799 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2800 Info.AllToInit.push_back(Value); 2801 } else if (!AnyErrors) { 2802 CXXCtorInitializer *CXXBaseInit; 2803 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2804 Base, /*IsInheritedVirtualBase=*/false, 2805 CXXBaseInit)) { 2806 HadError = true; 2807 continue; 2808 } 2809 2810 Info.AllToInit.push_back(CXXBaseInit); 2811 } 2812 } 2813 2814 // Fields. 2815 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2816 MemEnd = ClassDecl->decls_end(); 2817 Mem != MemEnd; ++Mem) { 2818 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2819 if (F->getType()->isIncompleteArrayType()) { 2820 assert(ClassDecl->hasFlexibleArrayMember() && 2821 "Incomplete array type is not valid"); 2822 continue; 2823 } 2824 2825 // If we're not generating the implicit copy/move constructor, then we'll 2826 // handle anonymous struct/union fields based on their individual 2827 // indirect fields. 2828 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2829 continue; 2830 2831 if (CollectFieldInitializer(*this, Info, F)) 2832 HadError = true; 2833 continue; 2834 } 2835 2836 // Beyond this point, we only consider default initialization. 2837 if (Info.IIK != IIK_Default) 2838 continue; 2839 2840 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2841 if (F->getType()->isIncompleteArrayType()) { 2842 assert(ClassDecl->hasFlexibleArrayMember() && 2843 "Incomplete array type is not valid"); 2844 continue; 2845 } 2846 2847 // Initialize each field of an anonymous struct individually. 2848 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2849 HadError = true; 2850 2851 continue; 2852 } 2853 } 2854 2855 NumInitializers = Info.AllToInit.size(); 2856 if (NumInitializers > 0) { 2857 Constructor->setNumCtorInitializers(NumInitializers); 2858 CXXCtorInitializer **baseOrMemberInitializers = 2859 new (Context) CXXCtorInitializer*[NumInitializers]; 2860 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2861 NumInitializers * sizeof(CXXCtorInitializer*)); 2862 Constructor->setCtorInitializers(baseOrMemberInitializers); 2863 2864 // Constructors implicitly reference the base and member 2865 // destructors. 2866 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2867 Constructor->getParent()); 2868 } 2869 2870 return HadError; 2871} 2872 2873static void *GetKeyForTopLevelField(FieldDecl *Field) { 2874 // For anonymous unions, use the class declaration as the key. 2875 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2876 if (RT->getDecl()->isAnonymousStructOrUnion()) 2877 return static_cast<void *>(RT->getDecl()); 2878 } 2879 return static_cast<void *>(Field); 2880} 2881 2882static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2883 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2884} 2885 2886static void *GetKeyForMember(ASTContext &Context, 2887 CXXCtorInitializer *Member) { 2888 if (!Member->isAnyMemberInitializer()) 2889 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2890 2891 // For fields injected into the class via declaration of an anonymous union, 2892 // use its anonymous union class declaration as the unique key. 2893 FieldDecl *Field = Member->getAnyMember(); 2894 2895 // If the field is a member of an anonymous struct or union, our key 2896 // is the anonymous record decl that's a direct child of the class. 2897 RecordDecl *RD = Field->getParent(); 2898 if (RD->isAnonymousStructOrUnion()) { 2899 while (true) { 2900 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2901 if (Parent->isAnonymousStructOrUnion()) 2902 RD = Parent; 2903 else 2904 break; 2905 } 2906 2907 return static_cast<void *>(RD); 2908 } 2909 2910 return static_cast<void *>(Field); 2911} 2912 2913static void 2914DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2915 const CXXConstructorDecl *Constructor, 2916 CXXCtorInitializer **Inits, 2917 unsigned NumInits) { 2918 if (Constructor->getDeclContext()->isDependentContext()) 2919 return; 2920 2921 // Don't check initializers order unless the warning is enabled at the 2922 // location of at least one initializer. 2923 bool ShouldCheckOrder = false; 2924 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2925 CXXCtorInitializer *Init = Inits[InitIndex]; 2926 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2927 Init->getSourceLocation()) 2928 != DiagnosticsEngine::Ignored) { 2929 ShouldCheckOrder = true; 2930 break; 2931 } 2932 } 2933 if (!ShouldCheckOrder) 2934 return; 2935 2936 // Build the list of bases and members in the order that they'll 2937 // actually be initialized. The explicit initializers should be in 2938 // this same order but may be missing things. 2939 SmallVector<const void*, 32> IdealInitKeys; 2940 2941 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2942 2943 // 1. Virtual bases. 2944 for (CXXRecordDecl::base_class_const_iterator VBase = 2945 ClassDecl->vbases_begin(), 2946 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2947 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2948 2949 // 2. Non-virtual bases. 2950 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2951 E = ClassDecl->bases_end(); Base != E; ++Base) { 2952 if (Base->isVirtual()) 2953 continue; 2954 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2955 } 2956 2957 // 3. Direct fields. 2958 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2959 E = ClassDecl->field_end(); Field != E; ++Field) 2960 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2961 2962 unsigned NumIdealInits = IdealInitKeys.size(); 2963 unsigned IdealIndex = 0; 2964 2965 CXXCtorInitializer *PrevInit = 0; 2966 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2967 CXXCtorInitializer *Init = Inits[InitIndex]; 2968 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2969 2970 // Scan forward to try to find this initializer in the idealized 2971 // initializers list. 2972 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2973 if (InitKey == IdealInitKeys[IdealIndex]) 2974 break; 2975 2976 // If we didn't find this initializer, it must be because we 2977 // scanned past it on a previous iteration. That can only 2978 // happen if we're out of order; emit a warning. 2979 if (IdealIndex == NumIdealInits && PrevInit) { 2980 Sema::SemaDiagnosticBuilder D = 2981 SemaRef.Diag(PrevInit->getSourceLocation(), 2982 diag::warn_initializer_out_of_order); 2983 2984 if (PrevInit->isAnyMemberInitializer()) 2985 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2986 else 2987 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2988 2989 if (Init->isAnyMemberInitializer()) 2990 D << 0 << Init->getAnyMember()->getDeclName(); 2991 else 2992 D << 1 << Init->getBaseClassInfo()->getType(); 2993 2994 // Move back to the initializer's location in the ideal list. 2995 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2996 if (InitKey == IdealInitKeys[IdealIndex]) 2997 break; 2998 2999 assert(IdealIndex != NumIdealInits && 3000 "initializer not found in initializer list"); 3001 } 3002 3003 PrevInit = Init; 3004 } 3005} 3006 3007namespace { 3008bool CheckRedundantInit(Sema &S, 3009 CXXCtorInitializer *Init, 3010 CXXCtorInitializer *&PrevInit) { 3011 if (!PrevInit) { 3012 PrevInit = Init; 3013 return false; 3014 } 3015 3016 if (FieldDecl *Field = Init->getMember()) 3017 S.Diag(Init->getSourceLocation(), 3018 diag::err_multiple_mem_initialization) 3019 << Field->getDeclName() 3020 << Init->getSourceRange(); 3021 else { 3022 const Type *BaseClass = Init->getBaseClass(); 3023 assert(BaseClass && "neither field nor base"); 3024 S.Diag(Init->getSourceLocation(), 3025 diag::err_multiple_base_initialization) 3026 << QualType(BaseClass, 0) 3027 << Init->getSourceRange(); 3028 } 3029 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3030 << 0 << PrevInit->getSourceRange(); 3031 3032 return true; 3033} 3034 3035typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3036typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3037 3038bool CheckRedundantUnionInit(Sema &S, 3039 CXXCtorInitializer *Init, 3040 RedundantUnionMap &Unions) { 3041 FieldDecl *Field = Init->getAnyMember(); 3042 RecordDecl *Parent = Field->getParent(); 3043 if (!Parent->isAnonymousStructOrUnion()) 3044 return false; 3045 3046 NamedDecl *Child = Field; 3047 do { 3048 if (Parent->isUnion()) { 3049 UnionEntry &En = Unions[Parent]; 3050 if (En.first && En.first != Child) { 3051 S.Diag(Init->getSourceLocation(), 3052 diag::err_multiple_mem_union_initialization) 3053 << Field->getDeclName() 3054 << Init->getSourceRange(); 3055 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3056 << 0 << En.second->getSourceRange(); 3057 return true; 3058 } else if (!En.first) { 3059 En.first = Child; 3060 En.second = Init; 3061 } 3062 } 3063 3064 Child = Parent; 3065 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3066 } while (Parent->isAnonymousStructOrUnion()); 3067 3068 return false; 3069} 3070} 3071 3072/// ActOnMemInitializers - Handle the member initializers for a constructor. 3073void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3074 SourceLocation ColonLoc, 3075 CXXCtorInitializer **meminits, 3076 unsigned NumMemInits, 3077 bool AnyErrors) { 3078 if (!ConstructorDecl) 3079 return; 3080 3081 AdjustDeclIfTemplate(ConstructorDecl); 3082 3083 CXXConstructorDecl *Constructor 3084 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3085 3086 if (!Constructor) { 3087 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3088 return; 3089 } 3090 3091 CXXCtorInitializer **MemInits = 3092 reinterpret_cast<CXXCtorInitializer **>(meminits); 3093 3094 // Mapping for the duplicate initializers check. 3095 // For member initializers, this is keyed with a FieldDecl*. 3096 // For base initializers, this is keyed with a Type*. 3097 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3098 3099 // Mapping for the inconsistent anonymous-union initializers check. 3100 RedundantUnionMap MemberUnions; 3101 3102 bool HadError = false; 3103 for (unsigned i = 0; i < NumMemInits; i++) { 3104 CXXCtorInitializer *Init = MemInits[i]; 3105 3106 // Set the source order index. 3107 Init->setSourceOrder(i); 3108 3109 if (Init->isAnyMemberInitializer()) { 3110 FieldDecl *Field = Init->getAnyMember(); 3111 if (CheckRedundantInit(*this, Init, Members[Field]) || 3112 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3113 HadError = true; 3114 } else if (Init->isBaseInitializer()) { 3115 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3116 if (CheckRedundantInit(*this, Init, Members[Key])) 3117 HadError = true; 3118 } else { 3119 assert(Init->isDelegatingInitializer()); 3120 // This must be the only initializer 3121 if (i != 0 || NumMemInits > 1) { 3122 Diag(MemInits[0]->getSourceLocation(), 3123 diag::err_delegating_initializer_alone) 3124 << MemInits[0]->getSourceRange(); 3125 HadError = true; 3126 // We will treat this as being the only initializer. 3127 } 3128 SetDelegatingInitializer(Constructor, MemInits[i]); 3129 // Return immediately as the initializer is set. 3130 return; 3131 } 3132 } 3133 3134 if (HadError) 3135 return; 3136 3137 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3138 3139 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3140} 3141 3142void 3143Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3144 CXXRecordDecl *ClassDecl) { 3145 // Ignore dependent contexts. Also ignore unions, since their members never 3146 // have destructors implicitly called. 3147 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3148 return; 3149 3150 // FIXME: all the access-control diagnostics are positioned on the 3151 // field/base declaration. That's probably good; that said, the 3152 // user might reasonably want to know why the destructor is being 3153 // emitted, and we currently don't say. 3154 3155 // Non-static data members. 3156 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3157 E = ClassDecl->field_end(); I != E; ++I) { 3158 FieldDecl *Field = *I; 3159 if (Field->isInvalidDecl()) 3160 continue; 3161 QualType FieldType = Context.getBaseElementType(Field->getType()); 3162 3163 const RecordType* RT = FieldType->getAs<RecordType>(); 3164 if (!RT) 3165 continue; 3166 3167 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3168 if (FieldClassDecl->isInvalidDecl()) 3169 continue; 3170 if (FieldClassDecl->hasTrivialDestructor()) 3171 continue; 3172 3173 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3174 assert(Dtor && "No dtor found for FieldClassDecl!"); 3175 CheckDestructorAccess(Field->getLocation(), Dtor, 3176 PDiag(diag::err_access_dtor_field) 3177 << Field->getDeclName() 3178 << FieldType); 3179 3180 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3181 } 3182 3183 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3184 3185 // Bases. 3186 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3187 E = ClassDecl->bases_end(); Base != E; ++Base) { 3188 // Bases are always records in a well-formed non-dependent class. 3189 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3190 3191 // Remember direct virtual bases. 3192 if (Base->isVirtual()) 3193 DirectVirtualBases.insert(RT); 3194 3195 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3196 // If our base class is invalid, we probably can't get its dtor anyway. 3197 if (BaseClassDecl->isInvalidDecl()) 3198 continue; 3199 // Ignore trivial destructors. 3200 if (BaseClassDecl->hasTrivialDestructor()) 3201 continue; 3202 3203 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3204 assert(Dtor && "No dtor found for BaseClassDecl!"); 3205 3206 // FIXME: caret should be on the start of the class name 3207 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3208 PDiag(diag::err_access_dtor_base) 3209 << Base->getType() 3210 << Base->getSourceRange()); 3211 3212 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3213 } 3214 3215 // Virtual bases. 3216 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3217 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3218 3219 // Bases are always records in a well-formed non-dependent class. 3220 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3221 3222 // Ignore direct virtual bases. 3223 if (DirectVirtualBases.count(RT)) 3224 continue; 3225 3226 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3227 // If our base class is invalid, we probably can't get its dtor anyway. 3228 if (BaseClassDecl->isInvalidDecl()) 3229 continue; 3230 // Ignore trivial destructors. 3231 if (BaseClassDecl->hasTrivialDestructor()) 3232 continue; 3233 3234 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3235 assert(Dtor && "No dtor found for BaseClassDecl!"); 3236 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3237 PDiag(diag::err_access_dtor_vbase) 3238 << VBase->getType()); 3239 3240 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3241 } 3242} 3243 3244void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3245 if (!CDtorDecl) 3246 return; 3247 3248 if (CXXConstructorDecl *Constructor 3249 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3250 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3251} 3252 3253bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3254 unsigned DiagID, AbstractDiagSelID SelID) { 3255 if (SelID == -1) 3256 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3257 else 3258 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3259} 3260 3261bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3262 const PartialDiagnostic &PD) { 3263 if (!getLangOptions().CPlusPlus) 3264 return false; 3265 3266 if (const ArrayType *AT = Context.getAsArrayType(T)) 3267 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3268 3269 if (const PointerType *PT = T->getAs<PointerType>()) { 3270 // Find the innermost pointer type. 3271 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3272 PT = T; 3273 3274 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3275 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3276 } 3277 3278 const RecordType *RT = T->getAs<RecordType>(); 3279 if (!RT) 3280 return false; 3281 3282 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3283 3284 // We can't answer whether something is abstract until it has a 3285 // definition. If it's currently being defined, we'll walk back 3286 // over all the declarations when we have a full definition. 3287 const CXXRecordDecl *Def = RD->getDefinition(); 3288 if (!Def || Def->isBeingDefined()) 3289 return false; 3290 3291 if (!RD->isAbstract()) 3292 return false; 3293 3294 Diag(Loc, PD) << RD->getDeclName(); 3295 DiagnoseAbstractType(RD); 3296 3297 return true; 3298} 3299 3300void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3301 // Check if we've already emitted the list of pure virtual functions 3302 // for this class. 3303 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3304 return; 3305 3306 CXXFinalOverriderMap FinalOverriders; 3307 RD->getFinalOverriders(FinalOverriders); 3308 3309 // Keep a set of seen pure methods so we won't diagnose the same method 3310 // more than once. 3311 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3312 3313 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3314 MEnd = FinalOverriders.end(); 3315 M != MEnd; 3316 ++M) { 3317 for (OverridingMethods::iterator SO = M->second.begin(), 3318 SOEnd = M->second.end(); 3319 SO != SOEnd; ++SO) { 3320 // C++ [class.abstract]p4: 3321 // A class is abstract if it contains or inherits at least one 3322 // pure virtual function for which the final overrider is pure 3323 // virtual. 3324 3325 // 3326 if (SO->second.size() != 1) 3327 continue; 3328 3329 if (!SO->second.front().Method->isPure()) 3330 continue; 3331 3332 if (!SeenPureMethods.insert(SO->second.front().Method)) 3333 continue; 3334 3335 Diag(SO->second.front().Method->getLocation(), 3336 diag::note_pure_virtual_function) 3337 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3338 } 3339 } 3340 3341 if (!PureVirtualClassDiagSet) 3342 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3343 PureVirtualClassDiagSet->insert(RD); 3344} 3345 3346namespace { 3347struct AbstractUsageInfo { 3348 Sema &S; 3349 CXXRecordDecl *Record; 3350 CanQualType AbstractType; 3351 bool Invalid; 3352 3353 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3354 : S(S), Record(Record), 3355 AbstractType(S.Context.getCanonicalType( 3356 S.Context.getTypeDeclType(Record))), 3357 Invalid(false) {} 3358 3359 void DiagnoseAbstractType() { 3360 if (Invalid) return; 3361 S.DiagnoseAbstractType(Record); 3362 Invalid = true; 3363 } 3364 3365 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3366}; 3367 3368struct CheckAbstractUsage { 3369 AbstractUsageInfo &Info; 3370 const NamedDecl *Ctx; 3371 3372 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3373 : Info(Info), Ctx(Ctx) {} 3374 3375 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3376 switch (TL.getTypeLocClass()) { 3377#define ABSTRACT_TYPELOC(CLASS, PARENT) 3378#define TYPELOC(CLASS, PARENT) \ 3379 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3380#include "clang/AST/TypeLocNodes.def" 3381 } 3382 } 3383 3384 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3385 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3386 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3387 if (!TL.getArg(I)) 3388 continue; 3389 3390 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3391 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3392 } 3393 } 3394 3395 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3396 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3397 } 3398 3399 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3400 // Visit the type parameters from a permissive context. 3401 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3402 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3403 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3404 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3405 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3406 // TODO: other template argument types? 3407 } 3408 } 3409 3410 // Visit pointee types from a permissive context. 3411#define CheckPolymorphic(Type) \ 3412 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3413 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3414 } 3415 CheckPolymorphic(PointerTypeLoc) 3416 CheckPolymorphic(ReferenceTypeLoc) 3417 CheckPolymorphic(MemberPointerTypeLoc) 3418 CheckPolymorphic(BlockPointerTypeLoc) 3419 CheckPolymorphic(AtomicTypeLoc) 3420 3421 /// Handle all the types we haven't given a more specific 3422 /// implementation for above. 3423 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3424 // Every other kind of type that we haven't called out already 3425 // that has an inner type is either (1) sugar or (2) contains that 3426 // inner type in some way as a subobject. 3427 if (TypeLoc Next = TL.getNextTypeLoc()) 3428 return Visit(Next, Sel); 3429 3430 // If there's no inner type and we're in a permissive context, 3431 // don't diagnose. 3432 if (Sel == Sema::AbstractNone) return; 3433 3434 // Check whether the type matches the abstract type. 3435 QualType T = TL.getType(); 3436 if (T->isArrayType()) { 3437 Sel = Sema::AbstractArrayType; 3438 T = Info.S.Context.getBaseElementType(T); 3439 } 3440 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3441 if (CT != Info.AbstractType) return; 3442 3443 // It matched; do some magic. 3444 if (Sel == Sema::AbstractArrayType) { 3445 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3446 << T << TL.getSourceRange(); 3447 } else { 3448 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3449 << Sel << T << TL.getSourceRange(); 3450 } 3451 Info.DiagnoseAbstractType(); 3452 } 3453}; 3454 3455void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3456 Sema::AbstractDiagSelID Sel) { 3457 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3458} 3459 3460} 3461 3462/// Check for invalid uses of an abstract type in a method declaration. 3463static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3464 CXXMethodDecl *MD) { 3465 // No need to do the check on definitions, which require that 3466 // the return/param types be complete. 3467 if (MD->doesThisDeclarationHaveABody()) 3468 return; 3469 3470 // For safety's sake, just ignore it if we don't have type source 3471 // information. This should never happen for non-implicit methods, 3472 // but... 3473 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3474 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3475} 3476 3477/// Check for invalid uses of an abstract type within a class definition. 3478static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3479 CXXRecordDecl *RD) { 3480 for (CXXRecordDecl::decl_iterator 3481 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3482 Decl *D = *I; 3483 if (D->isImplicit()) continue; 3484 3485 // Methods and method templates. 3486 if (isa<CXXMethodDecl>(D)) { 3487 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3488 } else if (isa<FunctionTemplateDecl>(D)) { 3489 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3490 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3491 3492 // Fields and static variables. 3493 } else if (isa<FieldDecl>(D)) { 3494 FieldDecl *FD = cast<FieldDecl>(D); 3495 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3496 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3497 } else if (isa<VarDecl>(D)) { 3498 VarDecl *VD = cast<VarDecl>(D); 3499 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3500 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3501 3502 // Nested classes and class templates. 3503 } else if (isa<CXXRecordDecl>(D)) { 3504 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3505 } else if (isa<ClassTemplateDecl>(D)) { 3506 CheckAbstractClassUsage(Info, 3507 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3508 } 3509 } 3510} 3511 3512/// \brief Perform semantic checks on a class definition that has been 3513/// completing, introducing implicitly-declared members, checking for 3514/// abstract types, etc. 3515void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3516 if (!Record) 3517 return; 3518 3519 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3520 AbstractUsageInfo Info(*this, Record); 3521 CheckAbstractClassUsage(Info, Record); 3522 } 3523 3524 // If this is not an aggregate type and has no user-declared constructor, 3525 // complain about any non-static data members of reference or const scalar 3526 // type, since they will never get initializers. 3527 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3528 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3529 bool Complained = false; 3530 for (RecordDecl::field_iterator F = Record->field_begin(), 3531 FEnd = Record->field_end(); 3532 F != FEnd; ++F) { 3533 if (F->hasInClassInitializer()) 3534 continue; 3535 3536 if (F->getType()->isReferenceType() || 3537 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3538 if (!Complained) { 3539 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3540 << Record->getTagKind() << Record; 3541 Complained = true; 3542 } 3543 3544 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3545 << F->getType()->isReferenceType() 3546 << F->getDeclName(); 3547 } 3548 } 3549 } 3550 3551 if (Record->isDynamicClass() && !Record->isDependentType()) 3552 DynamicClasses.push_back(Record); 3553 3554 if (Record->getIdentifier()) { 3555 // C++ [class.mem]p13: 3556 // If T is the name of a class, then each of the following shall have a 3557 // name different from T: 3558 // - every member of every anonymous union that is a member of class T. 3559 // 3560 // C++ [class.mem]p14: 3561 // In addition, if class T has a user-declared constructor (12.1), every 3562 // non-static data member of class T shall have a name different from T. 3563 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3564 R.first != R.second; ++R.first) { 3565 NamedDecl *D = *R.first; 3566 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3567 isa<IndirectFieldDecl>(D)) { 3568 Diag(D->getLocation(), diag::err_member_name_of_class) 3569 << D->getDeclName(); 3570 break; 3571 } 3572 } 3573 } 3574 3575 // Warn if the class has virtual methods but non-virtual public destructor. 3576 if (Record->isPolymorphic() && !Record->isDependentType()) { 3577 CXXDestructorDecl *dtor = Record->getDestructor(); 3578 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3579 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3580 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3581 } 3582 3583 // See if a method overloads virtual methods in a base 3584 /// class without overriding any. 3585 if (!Record->isDependentType()) { 3586 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3587 MEnd = Record->method_end(); 3588 M != MEnd; ++M) { 3589 if (!(*M)->isStatic()) 3590 DiagnoseHiddenVirtualMethods(Record, *M); 3591 } 3592 } 3593 3594 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3595 // function that is not a constructor declares that member function to be 3596 // const. [...] The class of which that function is a member shall be 3597 // a literal type. 3598 // 3599 // It's fine to diagnose constructors here too: such constructors cannot 3600 // produce a constant expression, so are ill-formed (no diagnostic required). 3601 // 3602 // If the class has virtual bases, any constexpr members will already have 3603 // been diagnosed by the checks performed on the member declaration, so 3604 // suppress this (less useful) diagnostic. 3605 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3606 !Record->isLiteral() && !Record->getNumVBases()) { 3607 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3608 MEnd = Record->method_end(); 3609 M != MEnd; ++M) { 3610 if ((*M)->isConstexpr()) { 3611 switch (Record->getTemplateSpecializationKind()) { 3612 case TSK_ImplicitInstantiation: 3613 case TSK_ExplicitInstantiationDeclaration: 3614 case TSK_ExplicitInstantiationDefinition: 3615 // If a template instantiates to a non-literal type, but its members 3616 // instantiate to constexpr functions, the template is technically 3617 // ill-formed, but we allow it for sanity. Such members are treated as 3618 // non-constexpr. 3619 (*M)->setConstexpr(false); 3620 continue; 3621 3622 case TSK_Undeclared: 3623 case TSK_ExplicitSpecialization: 3624 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3625 PDiag(diag::err_constexpr_method_non_literal)); 3626 break; 3627 } 3628 3629 // Only produce one error per class. 3630 break; 3631 } 3632 } 3633 } 3634 3635 // Declare inherited constructors. We do this eagerly here because: 3636 // - The standard requires an eager diagnostic for conflicting inherited 3637 // constructors from different classes. 3638 // - The lazy declaration of the other implicit constructors is so as to not 3639 // waste space and performance on classes that are not meant to be 3640 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3641 // have inherited constructors. 3642 DeclareInheritedConstructors(Record); 3643 3644 if (!Record->isDependentType()) 3645 CheckExplicitlyDefaultedMethods(Record); 3646} 3647 3648void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3649 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3650 ME = Record->method_end(); 3651 MI != ME; ++MI) { 3652 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3653 switch (getSpecialMember(*MI)) { 3654 case CXXDefaultConstructor: 3655 CheckExplicitlyDefaultedDefaultConstructor( 3656 cast<CXXConstructorDecl>(*MI)); 3657 break; 3658 3659 case CXXDestructor: 3660 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3661 break; 3662 3663 case CXXCopyConstructor: 3664 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3665 break; 3666 3667 case CXXCopyAssignment: 3668 CheckExplicitlyDefaultedCopyAssignment(*MI); 3669 break; 3670 3671 case CXXMoveConstructor: 3672 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3673 break; 3674 3675 case CXXMoveAssignment: 3676 CheckExplicitlyDefaultedMoveAssignment(*MI); 3677 break; 3678 3679 case CXXInvalid: 3680 llvm_unreachable("non-special member explicitly defaulted!"); 3681 } 3682 } 3683 } 3684 3685} 3686 3687void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3688 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3689 3690 // Whether this was the first-declared instance of the constructor. 3691 // This affects whether we implicitly add an exception spec (and, eventually, 3692 // constexpr). It is also ill-formed to explicitly default a constructor such 3693 // that it would be deleted. (C++0x [decl.fct.def.default]) 3694 bool First = CD == CD->getCanonicalDecl(); 3695 3696 bool HadError = false; 3697 if (CD->getNumParams() != 0) { 3698 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3699 << CD->getSourceRange(); 3700 HadError = true; 3701 } 3702 3703 ImplicitExceptionSpecification Spec 3704 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3705 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3706 if (EPI.ExceptionSpecType == EST_Delayed) { 3707 // Exception specification depends on some deferred part of the class. We'll 3708 // try again when the class's definition has been fully processed. 3709 return; 3710 } 3711 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3712 *ExceptionType = Context.getFunctionType( 3713 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3714 3715 if (CtorType->hasExceptionSpec()) { 3716 if (CheckEquivalentExceptionSpec( 3717 PDiag(diag::err_incorrect_defaulted_exception_spec) 3718 << CXXDefaultConstructor, 3719 PDiag(), 3720 ExceptionType, SourceLocation(), 3721 CtorType, CD->getLocation())) { 3722 HadError = true; 3723 } 3724 } else if (First) { 3725 // We set the declaration to have the computed exception spec here. 3726 // We know there are no parameters. 3727 EPI.ExtInfo = CtorType->getExtInfo(); 3728 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3729 } 3730 3731 if (HadError) { 3732 CD->setInvalidDecl(); 3733 return; 3734 } 3735 3736 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3737 if (First) { 3738 CD->setDeletedAsWritten(); 3739 } else { 3740 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3741 << CXXDefaultConstructor; 3742 CD->setInvalidDecl(); 3743 } 3744 } 3745} 3746 3747void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3748 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3749 3750 // Whether this was the first-declared instance of the constructor. 3751 bool First = CD == CD->getCanonicalDecl(); 3752 3753 bool HadError = false; 3754 if (CD->getNumParams() != 1) { 3755 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3756 << CD->getSourceRange(); 3757 HadError = true; 3758 } 3759 3760 ImplicitExceptionSpecification Spec(Context); 3761 bool Const; 3762 llvm::tie(Spec, Const) = 3763 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3764 3765 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3766 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3767 *ExceptionType = Context.getFunctionType( 3768 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3769 3770 // Check for parameter type matching. 3771 // This is a copy ctor so we know it's a cv-qualified reference to T. 3772 QualType ArgType = CtorType->getArgType(0); 3773 if (ArgType->getPointeeType().isVolatileQualified()) { 3774 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3775 HadError = true; 3776 } 3777 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3778 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3779 HadError = true; 3780 } 3781 3782 if (CtorType->hasExceptionSpec()) { 3783 if (CheckEquivalentExceptionSpec( 3784 PDiag(diag::err_incorrect_defaulted_exception_spec) 3785 << CXXCopyConstructor, 3786 PDiag(), 3787 ExceptionType, SourceLocation(), 3788 CtorType, CD->getLocation())) { 3789 HadError = true; 3790 } 3791 } else if (First) { 3792 // We set the declaration to have the computed exception spec here. 3793 // We duplicate the one parameter type. 3794 EPI.ExtInfo = CtorType->getExtInfo(); 3795 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3796 } 3797 3798 if (HadError) { 3799 CD->setInvalidDecl(); 3800 return; 3801 } 3802 3803 if (ShouldDeleteCopyConstructor(CD)) { 3804 if (First) { 3805 CD->setDeletedAsWritten(); 3806 } else { 3807 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3808 << CXXCopyConstructor; 3809 CD->setInvalidDecl(); 3810 } 3811 } 3812} 3813 3814void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3815 assert(MD->isExplicitlyDefaulted()); 3816 3817 // Whether this was the first-declared instance of the operator 3818 bool First = MD == MD->getCanonicalDecl(); 3819 3820 bool HadError = false; 3821 if (MD->getNumParams() != 1) { 3822 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3823 << MD->getSourceRange(); 3824 HadError = true; 3825 } 3826 3827 QualType ReturnType = 3828 MD->getType()->getAs<FunctionType>()->getResultType(); 3829 if (!ReturnType->isLValueReferenceType() || 3830 !Context.hasSameType( 3831 Context.getCanonicalType(ReturnType->getPointeeType()), 3832 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3833 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3834 HadError = true; 3835 } 3836 3837 ImplicitExceptionSpecification Spec(Context); 3838 bool Const; 3839 llvm::tie(Spec, Const) = 3840 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3841 3842 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3843 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3844 *ExceptionType = Context.getFunctionType( 3845 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3846 3847 QualType ArgType = OperType->getArgType(0); 3848 if (!ArgType->isLValueReferenceType()) { 3849 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3850 HadError = true; 3851 } else { 3852 if (ArgType->getPointeeType().isVolatileQualified()) { 3853 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3854 HadError = true; 3855 } 3856 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3857 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3858 HadError = true; 3859 } 3860 } 3861 3862 if (OperType->getTypeQuals()) { 3863 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3864 HadError = true; 3865 } 3866 3867 if (OperType->hasExceptionSpec()) { 3868 if (CheckEquivalentExceptionSpec( 3869 PDiag(diag::err_incorrect_defaulted_exception_spec) 3870 << CXXCopyAssignment, 3871 PDiag(), 3872 ExceptionType, SourceLocation(), 3873 OperType, MD->getLocation())) { 3874 HadError = true; 3875 } 3876 } else if (First) { 3877 // We set the declaration to have the computed exception spec here. 3878 // We duplicate the one parameter type. 3879 EPI.RefQualifier = OperType->getRefQualifier(); 3880 EPI.ExtInfo = OperType->getExtInfo(); 3881 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3882 } 3883 3884 if (HadError) { 3885 MD->setInvalidDecl(); 3886 return; 3887 } 3888 3889 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3890 if (First) { 3891 MD->setDeletedAsWritten(); 3892 } else { 3893 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3894 << CXXCopyAssignment; 3895 MD->setInvalidDecl(); 3896 } 3897 } 3898} 3899 3900void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3901 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3902 3903 // Whether this was the first-declared instance of the constructor. 3904 bool First = CD == CD->getCanonicalDecl(); 3905 3906 bool HadError = false; 3907 if (CD->getNumParams() != 1) { 3908 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3909 << CD->getSourceRange(); 3910 HadError = true; 3911 } 3912 3913 ImplicitExceptionSpecification Spec( 3914 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3915 3916 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3917 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3918 *ExceptionType = Context.getFunctionType( 3919 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3920 3921 // Check for parameter type matching. 3922 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3923 QualType ArgType = CtorType->getArgType(0); 3924 if (ArgType->getPointeeType().isVolatileQualified()) { 3925 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3926 HadError = true; 3927 } 3928 if (ArgType->getPointeeType().isConstQualified()) { 3929 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3930 HadError = true; 3931 } 3932 3933 if (CtorType->hasExceptionSpec()) { 3934 if (CheckEquivalentExceptionSpec( 3935 PDiag(diag::err_incorrect_defaulted_exception_spec) 3936 << CXXMoveConstructor, 3937 PDiag(), 3938 ExceptionType, SourceLocation(), 3939 CtorType, CD->getLocation())) { 3940 HadError = true; 3941 } 3942 } else if (First) { 3943 // We set the declaration to have the computed exception spec here. 3944 // We duplicate the one parameter type. 3945 EPI.ExtInfo = CtorType->getExtInfo(); 3946 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3947 } 3948 3949 if (HadError) { 3950 CD->setInvalidDecl(); 3951 return; 3952 } 3953 3954 if (ShouldDeleteMoveConstructor(CD)) { 3955 if (First) { 3956 CD->setDeletedAsWritten(); 3957 } else { 3958 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3959 << CXXMoveConstructor; 3960 CD->setInvalidDecl(); 3961 } 3962 } 3963} 3964 3965void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3966 assert(MD->isExplicitlyDefaulted()); 3967 3968 // Whether this was the first-declared instance of the operator 3969 bool First = MD == MD->getCanonicalDecl(); 3970 3971 bool HadError = false; 3972 if (MD->getNumParams() != 1) { 3973 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 3974 << MD->getSourceRange(); 3975 HadError = true; 3976 } 3977 3978 QualType ReturnType = 3979 MD->getType()->getAs<FunctionType>()->getResultType(); 3980 if (!ReturnType->isLValueReferenceType() || 3981 !Context.hasSameType( 3982 Context.getCanonicalType(ReturnType->getPointeeType()), 3983 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3984 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 3985 HadError = true; 3986 } 3987 3988 ImplicitExceptionSpecification Spec( 3989 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 3990 3991 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3992 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3993 *ExceptionType = Context.getFunctionType( 3994 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3995 3996 QualType ArgType = OperType->getArgType(0); 3997 if (!ArgType->isRValueReferenceType()) { 3998 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 3999 HadError = true; 4000 } else { 4001 if (ArgType->getPointeeType().isVolatileQualified()) { 4002 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4003 HadError = true; 4004 } 4005 if (ArgType->getPointeeType().isConstQualified()) { 4006 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4007 HadError = true; 4008 } 4009 } 4010 4011 if (OperType->getTypeQuals()) { 4012 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4013 HadError = true; 4014 } 4015 4016 if (OperType->hasExceptionSpec()) { 4017 if (CheckEquivalentExceptionSpec( 4018 PDiag(diag::err_incorrect_defaulted_exception_spec) 4019 << CXXMoveAssignment, 4020 PDiag(), 4021 ExceptionType, SourceLocation(), 4022 OperType, MD->getLocation())) { 4023 HadError = true; 4024 } 4025 } else if (First) { 4026 // We set the declaration to have the computed exception spec here. 4027 // We duplicate the one parameter type. 4028 EPI.RefQualifier = OperType->getRefQualifier(); 4029 EPI.ExtInfo = OperType->getExtInfo(); 4030 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4031 } 4032 4033 if (HadError) { 4034 MD->setInvalidDecl(); 4035 return; 4036 } 4037 4038 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4039 if (First) { 4040 MD->setDeletedAsWritten(); 4041 } else { 4042 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4043 << CXXMoveAssignment; 4044 MD->setInvalidDecl(); 4045 } 4046 } 4047} 4048 4049void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4050 assert(DD->isExplicitlyDefaulted()); 4051 4052 // Whether this was the first-declared instance of the destructor. 4053 bool First = DD == DD->getCanonicalDecl(); 4054 4055 ImplicitExceptionSpecification Spec 4056 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4057 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4058 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4059 *ExceptionType = Context.getFunctionType( 4060 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4061 4062 if (DtorType->hasExceptionSpec()) { 4063 if (CheckEquivalentExceptionSpec( 4064 PDiag(diag::err_incorrect_defaulted_exception_spec) 4065 << CXXDestructor, 4066 PDiag(), 4067 ExceptionType, SourceLocation(), 4068 DtorType, DD->getLocation())) { 4069 DD->setInvalidDecl(); 4070 return; 4071 } 4072 } else if (First) { 4073 // We set the declaration to have the computed exception spec here. 4074 // There are no parameters. 4075 EPI.ExtInfo = DtorType->getExtInfo(); 4076 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4077 } 4078 4079 if (ShouldDeleteDestructor(DD)) { 4080 if (First) { 4081 DD->setDeletedAsWritten(); 4082 } else { 4083 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4084 << CXXDestructor; 4085 DD->setInvalidDecl(); 4086 } 4087 } 4088} 4089 4090/// This function implements the following C++0x paragraphs: 4091/// - [class.ctor]/5 4092bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4093 assert(!MD->isInvalidDecl()); 4094 CXXRecordDecl *RD = MD->getParent(); 4095 assert(!RD->isDependentType() && "do deletion after instantiation"); 4096 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4097 return false; 4098 4099 bool IsUnion = RD->isUnion(); 4100 bool IsConstructor = false; 4101 bool IsAssignment = false; 4102 bool IsMove = false; 4103 4104 bool ConstArg = false; 4105 4106 switch (CSM) { 4107 case CXXDefaultConstructor: 4108 IsConstructor = true; 4109 break; 4110 default: 4111 llvm_unreachable("function only currently implemented for default ctors"); 4112 } 4113 4114 SourceLocation Loc = MD->getLocation(); 4115 4116 // Do access control from the constructor 4117 ContextRAII MethodContext(*this, MD); 4118 4119 bool AllConst = true; 4120 4121 // We do this because we should never actually use an anonymous 4122 // union's constructor. 4123 if (IsUnion && RD->isAnonymousStructOrUnion()) 4124 return false; 4125 4126 // FIXME: We should put some diagnostic logic right into this function. 4127 4128 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4129 BE = RD->bases_end(); 4130 BI != BE; ++BI) { 4131 // We'll handle this one later 4132 if (BI->isVirtual()) 4133 continue; 4134 4135 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4136 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4137 4138 // Unless we have an assignment operator, the base's destructor must 4139 // be accessible and not deleted. 4140 if (!IsAssignment) { 4141 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4142 if (BaseDtor->isDeleted()) 4143 return true; 4144 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4145 AR_accessible) 4146 return true; 4147 } 4148 4149 // Finding the corresponding member in the base should lead to a 4150 // unique, accessible, non-deleted function. 4151 if (CSM != CXXDestructor) { 4152 SpecialMemberOverloadResult *SMOR = 4153 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, IsMove, false, 4154 false); 4155 if (!SMOR->hasSuccess()) 4156 return true; 4157 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4158 if (IsConstructor) { 4159 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4160 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4161 PDiag()) != AR_accessible) 4162 return true; 4163 } 4164 } 4165 } 4166 4167 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4168 BE = RD->vbases_end(); 4169 BI != BE; ++BI) { 4170 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4171 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4172 4173 // Unless we have an assignment operator, the base's destructor must 4174 // be accessible and not deleted. 4175 if (!IsAssignment) { 4176 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4177 if (BaseDtor->isDeleted()) 4178 return true; 4179 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4180 AR_accessible) 4181 return true; 4182 } 4183 4184 // Finding the corresponding member in the base should lead to a 4185 // unique, accessible, non-deleted function. 4186 if (CSM != CXXDestructor) { 4187 SpecialMemberOverloadResult *SMOR = 4188 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, IsMove, false, 4189 false); 4190 if (!SMOR->hasSuccess()) 4191 return true; 4192 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4193 if (IsConstructor) { 4194 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4195 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4196 PDiag()) != AR_accessible) 4197 return true; 4198 } 4199 } 4200 } 4201 4202 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4203 FE = RD->field_end(); 4204 FI != FE; ++FI) { 4205 if (FI->isInvalidDecl()) 4206 continue; 4207 4208 QualType FieldType = Context.getBaseElementType(FI->getType()); 4209 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4210 4211 // For a default constructor, all references must be initialized in-class 4212 // and, if a union, it must have a non-const member. 4213 if (CSM == CXXDefaultConstructor) { 4214 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4215 return true; 4216 4217 if (IsUnion && !FieldType.isConstQualified()) 4218 AllConst = false; 4219 } 4220 4221 if (FieldRecord) { 4222 // Unless we're doing assignment, the field's destructor must be 4223 // accessible and not deleted. 4224 if (!IsAssignment) { 4225 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4226 if (FieldDtor->isDeleted()) 4227 return true; 4228 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4229 AR_accessible) 4230 return true; 4231 } 4232 4233 // For a default constructor, a const member must have a user-provided 4234 // default constructor or else be explicitly initialized. 4235 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4236 !FI->hasInClassInitializer() && 4237 !FieldRecord->hasUserProvidedDefaultConstructor()) 4238 return true; 4239 4240 // For a default constructor, additional restrictions exist on the 4241 // variant members. 4242 if (CSM == CXXDefaultConstructor && !IsUnion && FieldRecord->isUnion() && 4243 FieldRecord->isAnonymousStructOrUnion()) { 4244 // We're okay to reuse AllConst here since we only care about the 4245 // value otherwise if we're in a union. 4246 AllConst = true; 4247 4248 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4249 UE = FieldRecord->field_end(); 4250 UI != UE; ++UI) { 4251 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4252 CXXRecordDecl *UnionFieldRecord = 4253 UnionFieldType->getAsCXXRecordDecl(); 4254 4255 if (!UnionFieldType.isConstQualified()) 4256 AllConst = false; 4257 4258 if (UnionFieldRecord && 4259 !UnionFieldRecord->hasTrivialDefaultConstructor()) 4260 return true; 4261 } 4262 4263 if (AllConst) 4264 return true; 4265 4266 // Don't try to initialize the anonymous union 4267 // This is technically non-conformant, but sanity demands it. 4268 continue; 4269 } 4270 4271 // Check that the corresponding member of the field is accessible, 4272 // unique, and non-deleted. We don't do this if it has an explicit 4273 // initialization when default-constructing. 4274 if (CSM != CXXDestructor && 4275 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4276 SpecialMemberOverloadResult *SMOR = 4277 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, IsMove, false, 4278 false); 4279 if (!SMOR->hasSuccess()) 4280 return true; 4281 4282 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4283 if (IsConstructor) { 4284 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4285 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4286 PDiag()) != AR_accessible) 4287 return true; 4288 } 4289 4290 // We need the corresponding member of a union to be trivial so that 4291 // we can safely copy them all simultaneously. 4292 // FIXME: Note that performing the check here (where we rely on the lack 4293 // of an in-class initializer) is technically ill-formed. However, this 4294 // seems most obviously to be a bug in the standard. 4295 if (IsUnion && !FieldMember->isTrivial()) 4296 return true; 4297 } 4298 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4299 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4300 // We can't initialize a const member of non-class type to any value. 4301 return true; 4302 } 4303 } 4304 4305 // We can't have all const members in a union when default-constructing, 4306 // or else they're all nonsensical garbage values that can't be changed. 4307 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4308 return true; 4309 4310 return false; 4311} 4312 4313bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 4314 CXXRecordDecl *RD = CD->getParent(); 4315 assert(!RD->isDependentType() && "do deletion after instantiation"); 4316 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4317 return false; 4318 4319 SourceLocation Loc = CD->getLocation(); 4320 4321 // Do access control from the constructor 4322 ContextRAII CtorContext(*this, CD); 4323 4324 bool Union = RD->isUnion(); 4325 4326 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 4327 "copy assignment arg has no pointee type"); 4328 unsigned ArgQuals = 4329 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4330 Qualifiers::Const : 0; 4331 4332 // We do this because we should never actually use an anonymous 4333 // union's constructor. 4334 if (Union && RD->isAnonymousStructOrUnion()) 4335 return false; 4336 4337 // FIXME: We should put some diagnostic logic right into this function. 4338 4339 // C++0x [class.copy]/11 4340 // A defaulted [copy] constructor for class X is defined as delete if X has: 4341 4342 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4343 BE = RD->bases_end(); 4344 BI != BE; ++BI) { 4345 // We'll handle this one later 4346 if (BI->isVirtual()) 4347 continue; 4348 4349 QualType BaseType = BI->getType(); 4350 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4351 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4352 4353 // -- any [direct base class] of a type with a destructor that is deleted or 4354 // inaccessible from the defaulted constructor 4355 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4356 if (BaseDtor->isDeleted()) 4357 return true; 4358 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4359 AR_accessible) 4360 return true; 4361 4362 // -- a [direct base class] B that cannot be [copied] because overload 4363 // resolution, as applied to B's [copy] constructor, results in an 4364 // ambiguity or a function that is deleted or inaccessible from the 4365 // defaulted constructor 4366 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 4367 if (!BaseCtor || BaseCtor->isDeleted()) 4368 return true; 4369 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4370 AR_accessible) 4371 return true; 4372 } 4373 4374 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4375 BE = RD->vbases_end(); 4376 BI != BE; ++BI) { 4377 QualType BaseType = BI->getType(); 4378 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4379 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4380 4381 // -- any [virtual base class] of a type with a destructor that is deleted or 4382 // inaccessible from the defaulted constructor 4383 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4384 if (BaseDtor->isDeleted()) 4385 return true; 4386 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4387 AR_accessible) 4388 return true; 4389 4390 // -- a [virtual base class] B that cannot be [copied] because overload 4391 // resolution, as applied to B's [copy] constructor, results in an 4392 // ambiguity or a function that is deleted or inaccessible from the 4393 // defaulted constructor 4394 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 4395 if (!BaseCtor || BaseCtor->isDeleted()) 4396 return true; 4397 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4398 AR_accessible) 4399 return true; 4400 } 4401 4402 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4403 FE = RD->field_end(); 4404 FI != FE; ++FI) { 4405 QualType FieldType = Context.getBaseElementType(FI->getType()); 4406 4407 // -- for a copy constructor, a non-static data member of rvalue reference 4408 // type 4409 if (FieldType->isRValueReferenceType()) 4410 return true; 4411 4412 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4413 4414 if (FieldRecord) { 4415 // This is an anonymous union 4416 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4417 // Anonymous unions inside unions do not variant members create 4418 if (!Union) { 4419 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4420 UE = FieldRecord->field_end(); 4421 UI != UE; ++UI) { 4422 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4423 CXXRecordDecl *UnionFieldRecord = 4424 UnionFieldType->getAsCXXRecordDecl(); 4425 4426 // -- a variant member with a non-trivial [copy] constructor and X 4427 // is a union-like class 4428 if (UnionFieldRecord && 4429 !UnionFieldRecord->hasTrivialCopyConstructor()) 4430 return true; 4431 } 4432 } 4433 4434 // Don't try to initalize an anonymous union 4435 continue; 4436 } else { 4437 // -- a variant member with a non-trivial [copy] constructor and X is a 4438 // union-like class 4439 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 4440 return true; 4441 4442 // -- any [non-static data member] of a type with a destructor that is 4443 // deleted or inaccessible from the defaulted constructor 4444 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4445 if (FieldDtor->isDeleted()) 4446 return true; 4447 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4448 AR_accessible) 4449 return true; 4450 } 4451 4452 // -- a [non-static data member of class type (or array thereof)] B that 4453 // cannot be [copied] because overload resolution, as applied to B's 4454 // [copy] constructor, results in an ambiguity or a function that is 4455 // deleted or inaccessible from the defaulted constructor 4456 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 4457 ArgQuals); 4458 if (!FieldCtor || FieldCtor->isDeleted()) 4459 return true; 4460 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4461 PDiag()) != AR_accessible) 4462 return true; 4463 } 4464 } 4465 4466 return false; 4467} 4468 4469bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4470 CXXRecordDecl *RD = MD->getParent(); 4471 assert(!RD->isDependentType() && "do deletion after instantiation"); 4472 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4473 return false; 4474 4475 SourceLocation Loc = MD->getLocation(); 4476 4477 // Do access control from the constructor 4478 ContextRAII MethodContext(*this, MD); 4479 4480 bool Union = RD->isUnion(); 4481 4482 unsigned ArgQuals = 4483 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4484 Qualifiers::Const : 0; 4485 4486 // We do this because we should never actually use an anonymous 4487 // union's constructor. 4488 if (Union && RD->isAnonymousStructOrUnion()) 4489 return false; 4490 4491 // FIXME: We should put some diagnostic logic right into this function. 4492 4493 // C++0x [class.copy]/20 4494 // A defaulted [copy] assignment operator for class X is defined as deleted 4495 // if X has: 4496 4497 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4498 BE = RD->bases_end(); 4499 BI != BE; ++BI) { 4500 // We'll handle this one later 4501 if (BI->isVirtual()) 4502 continue; 4503 4504 QualType BaseType = BI->getType(); 4505 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4506 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4507 4508 // -- a [direct base class] B that cannot be [copied] because overload 4509 // resolution, as applied to B's [copy] assignment operator, results in 4510 // an ambiguity or a function that is deleted or inaccessible from the 4511 // assignment operator 4512 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4513 0); 4514 if (!CopyOper || CopyOper->isDeleted()) 4515 return true; 4516 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4517 return true; 4518 } 4519 4520 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4521 BE = RD->vbases_end(); 4522 BI != BE; ++BI) { 4523 QualType BaseType = BI->getType(); 4524 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4525 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4526 4527 // -- a [virtual base class] B that cannot be [copied] because overload 4528 // resolution, as applied to B's [copy] assignment operator, results in 4529 // an ambiguity or a function that is deleted or inaccessible from the 4530 // assignment operator 4531 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4532 0); 4533 if (!CopyOper || CopyOper->isDeleted()) 4534 return true; 4535 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4536 return true; 4537 } 4538 4539 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4540 FE = RD->field_end(); 4541 FI != FE; ++FI) { 4542 QualType FieldType = Context.getBaseElementType(FI->getType()); 4543 4544 // -- a non-static data member of reference type 4545 if (FieldType->isReferenceType()) 4546 return true; 4547 4548 // -- a non-static data member of const non-class type (or array thereof) 4549 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4550 return true; 4551 4552 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4553 4554 if (FieldRecord) { 4555 // This is an anonymous union 4556 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4557 // Anonymous unions inside unions do not variant members create 4558 if (!Union) { 4559 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4560 UE = FieldRecord->field_end(); 4561 UI != UE; ++UI) { 4562 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4563 CXXRecordDecl *UnionFieldRecord = 4564 UnionFieldType->getAsCXXRecordDecl(); 4565 4566 // -- a variant member with a non-trivial [copy] assignment operator 4567 // and X is a union-like class 4568 if (UnionFieldRecord && 4569 !UnionFieldRecord->hasTrivialCopyAssignment()) 4570 return true; 4571 } 4572 } 4573 4574 // Don't try to initalize an anonymous union 4575 continue; 4576 // -- a variant member with a non-trivial [copy] assignment operator 4577 // and X is a union-like class 4578 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4579 return true; 4580 } 4581 4582 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4583 false, 0); 4584 if (!CopyOper || CopyOper->isDeleted()) 4585 return true; 4586 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4587 return true; 4588 } 4589 } 4590 4591 return false; 4592} 4593 4594bool Sema::ShouldDeleteMoveConstructor(CXXConstructorDecl *CD) { 4595 CXXRecordDecl *RD = CD->getParent(); 4596 assert(!RD->isDependentType() && "do deletion after instantiation"); 4597 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4598 return false; 4599 4600 SourceLocation Loc = CD->getLocation(); 4601 4602 // Do access control from the constructor 4603 ContextRAII CtorContext(*this, CD); 4604 4605 bool Union = RD->isUnion(); 4606 4607 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 4608 "copy assignment arg has no pointee type"); 4609 4610 // We do this because we should never actually use an anonymous 4611 // union's constructor. 4612 if (Union && RD->isAnonymousStructOrUnion()) 4613 return false; 4614 4615 // C++0x [class.copy]/11 4616 // A defaulted [move] constructor for class X is defined as deleted 4617 // if X has: 4618 4619 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4620 BE = RD->bases_end(); 4621 BI != BE; ++BI) { 4622 // We'll handle this one later 4623 if (BI->isVirtual()) 4624 continue; 4625 4626 QualType BaseType = BI->getType(); 4627 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4628 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4629 4630 // -- any [direct base class] of a type with a destructor that is deleted or 4631 // inaccessible from the defaulted constructor 4632 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4633 if (BaseDtor->isDeleted()) 4634 return true; 4635 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4636 AR_accessible) 4637 return true; 4638 4639 // -- a [direct base class] B that cannot be [moved] because overload 4640 // resolution, as applied to B's [move] constructor, results in an 4641 // ambiguity or a function that is deleted or inaccessible from the 4642 // defaulted constructor 4643 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4644 if (!BaseCtor || BaseCtor->isDeleted()) 4645 return true; 4646 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4647 AR_accessible) 4648 return true; 4649 4650 // -- for a move constructor, a [direct base class] with a type that 4651 // does not have a move constructor and is not trivially copyable. 4652 // If the field isn't a record, it's always trivially copyable. 4653 // A moving constructor could be a copy constructor instead. 4654 if (!BaseCtor->isMoveConstructor() && 4655 !BaseDecl->isTriviallyCopyable()) 4656 return true; 4657 } 4658 4659 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4660 BE = RD->vbases_end(); 4661 BI != BE; ++BI) { 4662 QualType BaseType = BI->getType(); 4663 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4664 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4665 4666 // -- any [virtual base class] of a type with a destructor that is deleted 4667 // or inaccessible from the defaulted constructor 4668 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4669 if (BaseDtor->isDeleted()) 4670 return true; 4671 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4672 AR_accessible) 4673 return true; 4674 4675 // -- a [virtual base class] B that cannot be [moved] because overload 4676 // resolution, as applied to B's [move] constructor, results in an 4677 // ambiguity or a function that is deleted or inaccessible from the 4678 // defaulted constructor 4679 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4680 if (!BaseCtor || BaseCtor->isDeleted()) 4681 return true; 4682 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4683 AR_accessible) 4684 return true; 4685 4686 // -- for a move constructor, a [virtual base class] with a type that 4687 // does not have a move constructor and is not trivially copyable. 4688 // If the field isn't a record, it's always trivially copyable. 4689 // A moving constructor could be a copy constructor instead. 4690 if (!BaseCtor->isMoveConstructor() && 4691 !BaseDecl->isTriviallyCopyable()) 4692 return true; 4693 } 4694 4695 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4696 FE = RD->field_end(); 4697 FI != FE; ++FI) { 4698 QualType FieldType = Context.getBaseElementType(FI->getType()); 4699 4700 if (CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl()) { 4701 // This is an anonymous union 4702 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4703 // Anonymous unions inside unions do not variant members create 4704 if (!Union) { 4705 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4706 UE = FieldRecord->field_end(); 4707 UI != UE; ++UI) { 4708 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4709 CXXRecordDecl *UnionFieldRecord = 4710 UnionFieldType->getAsCXXRecordDecl(); 4711 4712 // -- a variant member with a non-trivial [move] constructor and X 4713 // is a union-like class 4714 if (UnionFieldRecord && 4715 !UnionFieldRecord->hasTrivialMoveConstructor()) 4716 return true; 4717 } 4718 } 4719 4720 // Don't try to initalize an anonymous union 4721 continue; 4722 } else { 4723 // -- a variant member with a non-trivial [move] constructor and X is a 4724 // union-like class 4725 if (Union && !FieldRecord->hasTrivialMoveConstructor()) 4726 return true; 4727 4728 // -- any [non-static data member] of a type with a destructor that is 4729 // deleted or inaccessible from the defaulted constructor 4730 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4731 if (FieldDtor->isDeleted()) 4732 return true; 4733 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4734 AR_accessible) 4735 return true; 4736 } 4737 4738 // -- a [non-static data member of class type (or array thereof)] B that 4739 // cannot be [moved] because overload resolution, as applied to B's 4740 // [move] constructor, results in an ambiguity or a function that is 4741 // deleted or inaccessible from the defaulted constructor 4742 CXXConstructorDecl *FieldCtor = LookupMovingConstructor(FieldRecord); 4743 if (!FieldCtor || FieldCtor->isDeleted()) 4744 return true; 4745 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4746 PDiag()) != AR_accessible) 4747 return true; 4748 4749 // -- for a move constructor, a [non-static data member] with a type that 4750 // does not have a move constructor and is not trivially copyable. 4751 // If the field isn't a record, it's always trivially copyable. 4752 // A moving constructor could be a copy constructor instead. 4753 if (!FieldCtor->isMoveConstructor() && 4754 !FieldRecord->isTriviallyCopyable()) 4755 return true; 4756 } 4757 } 4758 4759 return false; 4760} 4761 4762bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4763 CXXRecordDecl *RD = MD->getParent(); 4764 assert(!RD->isDependentType() && "do deletion after instantiation"); 4765 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4766 return false; 4767 4768 SourceLocation Loc = MD->getLocation(); 4769 4770 // Do access control from the constructor 4771 ContextRAII MethodContext(*this, MD); 4772 4773 bool Union = RD->isUnion(); 4774 4775 // We do this because we should never actually use an anonymous 4776 // union's constructor. 4777 if (Union && RD->isAnonymousStructOrUnion()) 4778 return false; 4779 4780 // C++0x [class.copy]/20 4781 // A defaulted [move] assignment operator for class X is defined as deleted 4782 // if X has: 4783 4784 // -- for the move constructor, [...] any direct or indirect virtual base 4785 // class. 4786 if (RD->getNumVBases() != 0) 4787 return true; 4788 4789 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4790 BE = RD->bases_end(); 4791 BI != BE; ++BI) { 4792 4793 QualType BaseType = BI->getType(); 4794 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4795 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4796 4797 // -- a [direct base class] B that cannot be [moved] because overload 4798 // resolution, as applied to B's [move] assignment operator, results in 4799 // an ambiguity or a function that is deleted or inaccessible from the 4800 // assignment operator 4801 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4802 if (!MoveOper || MoveOper->isDeleted()) 4803 return true; 4804 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4805 return true; 4806 4807 // -- for the move assignment operator, a [direct base class] with a type 4808 // that does not have a move assignment operator and is not trivially 4809 // copyable. 4810 if (!MoveOper->isMoveAssignmentOperator() && 4811 !BaseDecl->isTriviallyCopyable()) 4812 return true; 4813 } 4814 4815 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4816 FE = RD->field_end(); 4817 FI != FE; ++FI) { 4818 QualType FieldType = Context.getBaseElementType(FI->getType()); 4819 4820 // -- a non-static data member of reference type 4821 if (FieldType->isReferenceType()) 4822 return true; 4823 4824 // -- a non-static data member of const non-class type (or array thereof) 4825 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4826 return true; 4827 4828 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4829 4830 if (FieldRecord) { 4831 // This is an anonymous union 4832 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4833 // Anonymous unions inside unions do not variant members create 4834 if (!Union) { 4835 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4836 UE = FieldRecord->field_end(); 4837 UI != UE; ++UI) { 4838 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4839 CXXRecordDecl *UnionFieldRecord = 4840 UnionFieldType->getAsCXXRecordDecl(); 4841 4842 // -- a variant member with a non-trivial [move] assignment operator 4843 // and X is a union-like class 4844 if (UnionFieldRecord && 4845 !UnionFieldRecord->hasTrivialMoveAssignment()) 4846 return true; 4847 } 4848 } 4849 4850 // Don't try to initalize an anonymous union 4851 continue; 4852 // -- a variant member with a non-trivial [move] assignment operator 4853 // and X is a union-like class 4854 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4855 return true; 4856 } 4857 4858 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4859 if (!MoveOper || MoveOper->isDeleted()) 4860 return true; 4861 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4862 return true; 4863 4864 // -- for the move assignment operator, a [non-static data member] with a 4865 // type that does not have a move assignment operator and is not 4866 // trivially copyable. 4867 if (!MoveOper->isMoveAssignmentOperator() && 4868 !FieldRecord->isTriviallyCopyable()) 4869 return true; 4870 } 4871 } 4872 4873 return false; 4874} 4875 4876bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4877 CXXRecordDecl *RD = DD->getParent(); 4878 assert(!RD->isDependentType() && "do deletion after instantiation"); 4879 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4880 return false; 4881 4882 SourceLocation Loc = DD->getLocation(); 4883 4884 // Do access control from the destructor 4885 ContextRAII CtorContext(*this, DD); 4886 4887 bool Union = RD->isUnion(); 4888 4889 // We do this because we should never actually use an anonymous 4890 // union's destructor. 4891 if (Union && RD->isAnonymousStructOrUnion()) 4892 return false; 4893 4894 // C++0x [class.dtor]p5 4895 // A defaulted destructor for a class X is defined as deleted if: 4896 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4897 BE = RD->bases_end(); 4898 BI != BE; ++BI) { 4899 // We'll handle this one later 4900 if (BI->isVirtual()) 4901 continue; 4902 4903 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4904 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4905 assert(BaseDtor && "base has no destructor"); 4906 4907 // -- any direct or virtual base class has a deleted destructor or 4908 // a destructor that is inaccessible from the defaulted destructor 4909 if (BaseDtor->isDeleted()) 4910 return true; 4911 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4912 AR_accessible) 4913 return true; 4914 } 4915 4916 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4917 BE = RD->vbases_end(); 4918 BI != BE; ++BI) { 4919 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4920 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4921 assert(BaseDtor && "base has no destructor"); 4922 4923 // -- any direct or virtual base class has a deleted destructor or 4924 // a destructor that is inaccessible from the defaulted destructor 4925 if (BaseDtor->isDeleted()) 4926 return true; 4927 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4928 AR_accessible) 4929 return true; 4930 } 4931 4932 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4933 FE = RD->field_end(); 4934 FI != FE; ++FI) { 4935 QualType FieldType = Context.getBaseElementType(FI->getType()); 4936 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4937 if (FieldRecord) { 4938 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4939 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4940 UE = FieldRecord->field_end(); 4941 UI != UE; ++UI) { 4942 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4943 CXXRecordDecl *UnionFieldRecord = 4944 UnionFieldType->getAsCXXRecordDecl(); 4945 4946 // -- X is a union-like class that has a variant member with a non- 4947 // trivial destructor. 4948 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4949 return true; 4950 } 4951 // Technically we are supposed to do this next check unconditionally. 4952 // But that makes absolutely no sense. 4953 } else { 4954 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4955 4956 // -- any of the non-static data members has class type M (or array 4957 // thereof) and M has a deleted destructor or a destructor that is 4958 // inaccessible from the defaulted destructor 4959 if (FieldDtor->isDeleted()) 4960 return true; 4961 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4962 AR_accessible) 4963 return true; 4964 4965 // -- X is a union-like class that has a variant member with a non- 4966 // trivial destructor. 4967 if (Union && !FieldDtor->isTrivial()) 4968 return true; 4969 } 4970 } 4971 } 4972 4973 if (DD->isVirtual()) { 4974 FunctionDecl *OperatorDelete = 0; 4975 DeclarationName Name = 4976 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4977 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4978 false)) 4979 return true; 4980 } 4981 4982 4983 return false; 4984} 4985 4986/// \brief Data used with FindHiddenVirtualMethod 4987namespace { 4988 struct FindHiddenVirtualMethodData { 4989 Sema *S; 4990 CXXMethodDecl *Method; 4991 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4992 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4993 }; 4994} 4995 4996/// \brief Member lookup function that determines whether a given C++ 4997/// method overloads virtual methods in a base class without overriding any, 4998/// to be used with CXXRecordDecl::lookupInBases(). 4999static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5000 CXXBasePath &Path, 5001 void *UserData) { 5002 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5003 5004 FindHiddenVirtualMethodData &Data 5005 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5006 5007 DeclarationName Name = Data.Method->getDeclName(); 5008 assert(Name.getNameKind() == DeclarationName::Identifier); 5009 5010 bool foundSameNameMethod = false; 5011 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5012 for (Path.Decls = BaseRecord->lookup(Name); 5013 Path.Decls.first != Path.Decls.second; 5014 ++Path.Decls.first) { 5015 NamedDecl *D = *Path.Decls.first; 5016 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5017 MD = MD->getCanonicalDecl(); 5018 foundSameNameMethod = true; 5019 // Interested only in hidden virtual methods. 5020 if (!MD->isVirtual()) 5021 continue; 5022 // If the method we are checking overrides a method from its base 5023 // don't warn about the other overloaded methods. 5024 if (!Data.S->IsOverload(Data.Method, MD, false)) 5025 return true; 5026 // Collect the overload only if its hidden. 5027 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 5028 overloadedMethods.push_back(MD); 5029 } 5030 } 5031 5032 if (foundSameNameMethod) 5033 Data.OverloadedMethods.append(overloadedMethods.begin(), 5034 overloadedMethods.end()); 5035 return foundSameNameMethod; 5036} 5037 5038/// \brief See if a method overloads virtual methods in a base class without 5039/// overriding any. 5040void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5041 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5042 MD->getLocation()) == DiagnosticsEngine::Ignored) 5043 return; 5044 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 5045 return; 5046 5047 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5048 /*bool RecordPaths=*/false, 5049 /*bool DetectVirtual=*/false); 5050 FindHiddenVirtualMethodData Data; 5051 Data.Method = MD; 5052 Data.S = this; 5053 5054 // Keep the base methods that were overriden or introduced in the subclass 5055 // by 'using' in a set. A base method not in this set is hidden. 5056 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 5057 res.first != res.second; ++res.first) { 5058 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 5059 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5060 E = MD->end_overridden_methods(); 5061 I != E; ++I) 5062 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 5063 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 5064 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 5065 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 5066 } 5067 5068 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5069 !Data.OverloadedMethods.empty()) { 5070 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5071 << MD << (Data.OverloadedMethods.size() > 1); 5072 5073 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5074 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5075 Diag(overloadedMD->getLocation(), 5076 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5077 } 5078 } 5079} 5080 5081void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5082 Decl *TagDecl, 5083 SourceLocation LBrac, 5084 SourceLocation RBrac, 5085 AttributeList *AttrList) { 5086 if (!TagDecl) 5087 return; 5088 5089 AdjustDeclIfTemplate(TagDecl); 5090 5091 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5092 // strict aliasing violation! 5093 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5094 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5095 5096 CheckCompletedCXXClass( 5097 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5098} 5099 5100/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5101/// special functions, such as the default constructor, copy 5102/// constructor, or destructor, to the given C++ class (C++ 5103/// [special]p1). This routine can only be executed just before the 5104/// definition of the class is complete. 5105void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5106 if (!ClassDecl->hasUserDeclaredConstructor()) 5107 ++ASTContext::NumImplicitDefaultConstructors; 5108 5109 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 5110 ++ASTContext::NumImplicitCopyConstructors; 5111 5112 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5113 ++ASTContext::NumImplicitCopyAssignmentOperators; 5114 5115 // If we have a dynamic class, then the copy assignment operator may be 5116 // virtual, so we have to declare it immediately. This ensures that, e.g., 5117 // it shows up in the right place in the vtable and that we diagnose 5118 // problems with the implicit exception specification. 5119 if (ClassDecl->isDynamicClass()) 5120 DeclareImplicitCopyAssignment(ClassDecl); 5121 } 5122 5123 if (!ClassDecl->hasUserDeclaredDestructor()) { 5124 ++ASTContext::NumImplicitDestructors; 5125 5126 // If we have a dynamic class, then the destructor may be virtual, so we 5127 // have to declare the destructor immediately. This ensures that, e.g., it 5128 // shows up in the right place in the vtable and that we diagnose problems 5129 // with the implicit exception specification. 5130 if (ClassDecl->isDynamicClass()) 5131 DeclareImplicitDestructor(ClassDecl); 5132 } 5133} 5134 5135void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5136 if (!D) 5137 return; 5138 5139 int NumParamList = D->getNumTemplateParameterLists(); 5140 for (int i = 0; i < NumParamList; i++) { 5141 TemplateParameterList* Params = D->getTemplateParameterList(i); 5142 for (TemplateParameterList::iterator Param = Params->begin(), 5143 ParamEnd = Params->end(); 5144 Param != ParamEnd; ++Param) { 5145 NamedDecl *Named = cast<NamedDecl>(*Param); 5146 if (Named->getDeclName()) { 5147 S->AddDecl(Named); 5148 IdResolver.AddDecl(Named); 5149 } 5150 } 5151 } 5152} 5153 5154void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5155 if (!D) 5156 return; 5157 5158 TemplateParameterList *Params = 0; 5159 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5160 Params = Template->getTemplateParameters(); 5161 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5162 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5163 Params = PartialSpec->getTemplateParameters(); 5164 else 5165 return; 5166 5167 for (TemplateParameterList::iterator Param = Params->begin(), 5168 ParamEnd = Params->end(); 5169 Param != ParamEnd; ++Param) { 5170 NamedDecl *Named = cast<NamedDecl>(*Param); 5171 if (Named->getDeclName()) { 5172 S->AddDecl(Named); 5173 IdResolver.AddDecl(Named); 5174 } 5175 } 5176} 5177 5178void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5179 if (!RecordD) return; 5180 AdjustDeclIfTemplate(RecordD); 5181 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5182 PushDeclContext(S, Record); 5183} 5184 5185void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5186 if (!RecordD) return; 5187 PopDeclContext(); 5188} 5189 5190/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5191/// parsing a top-level (non-nested) C++ class, and we are now 5192/// parsing those parts of the given Method declaration that could 5193/// not be parsed earlier (C++ [class.mem]p2), such as default 5194/// arguments. This action should enter the scope of the given 5195/// Method declaration as if we had just parsed the qualified method 5196/// name. However, it should not bring the parameters into scope; 5197/// that will be performed by ActOnDelayedCXXMethodParameter. 5198void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5199} 5200 5201/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5202/// C++ method declaration. We're (re-)introducing the given 5203/// function parameter into scope for use in parsing later parts of 5204/// the method declaration. For example, we could see an 5205/// ActOnParamDefaultArgument event for this parameter. 5206void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5207 if (!ParamD) 5208 return; 5209 5210 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5211 5212 // If this parameter has an unparsed default argument, clear it out 5213 // to make way for the parsed default argument. 5214 if (Param->hasUnparsedDefaultArg()) 5215 Param->setDefaultArg(0); 5216 5217 S->AddDecl(Param); 5218 if (Param->getDeclName()) 5219 IdResolver.AddDecl(Param); 5220} 5221 5222/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5223/// processing the delayed method declaration for Method. The method 5224/// declaration is now considered finished. There may be a separate 5225/// ActOnStartOfFunctionDef action later (not necessarily 5226/// immediately!) for this method, if it was also defined inside the 5227/// class body. 5228void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5229 if (!MethodD) 5230 return; 5231 5232 AdjustDeclIfTemplate(MethodD); 5233 5234 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5235 5236 // Now that we have our default arguments, check the constructor 5237 // again. It could produce additional diagnostics or affect whether 5238 // the class has implicitly-declared destructors, among other 5239 // things. 5240 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5241 CheckConstructor(Constructor); 5242 5243 // Check the default arguments, which we may have added. 5244 if (!Method->isInvalidDecl()) 5245 CheckCXXDefaultArguments(Method); 5246} 5247 5248/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5249/// the well-formedness of the constructor declarator @p D with type @p 5250/// R. If there are any errors in the declarator, this routine will 5251/// emit diagnostics and set the invalid bit to true. In any case, the type 5252/// will be updated to reflect a well-formed type for the constructor and 5253/// returned. 5254QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5255 StorageClass &SC) { 5256 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5257 5258 // C++ [class.ctor]p3: 5259 // A constructor shall not be virtual (10.3) or static (9.4). A 5260 // constructor can be invoked for a const, volatile or const 5261 // volatile object. A constructor shall not be declared const, 5262 // volatile, or const volatile (9.3.2). 5263 if (isVirtual) { 5264 if (!D.isInvalidType()) 5265 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5266 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5267 << SourceRange(D.getIdentifierLoc()); 5268 D.setInvalidType(); 5269 } 5270 if (SC == SC_Static) { 5271 if (!D.isInvalidType()) 5272 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5273 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5274 << SourceRange(D.getIdentifierLoc()); 5275 D.setInvalidType(); 5276 SC = SC_None; 5277 } 5278 5279 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5280 if (FTI.TypeQuals != 0) { 5281 if (FTI.TypeQuals & Qualifiers::Const) 5282 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5283 << "const" << SourceRange(D.getIdentifierLoc()); 5284 if (FTI.TypeQuals & Qualifiers::Volatile) 5285 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5286 << "volatile" << SourceRange(D.getIdentifierLoc()); 5287 if (FTI.TypeQuals & Qualifiers::Restrict) 5288 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5289 << "restrict" << SourceRange(D.getIdentifierLoc()); 5290 D.setInvalidType(); 5291 } 5292 5293 // C++0x [class.ctor]p4: 5294 // A constructor shall not be declared with a ref-qualifier. 5295 if (FTI.hasRefQualifier()) { 5296 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5297 << FTI.RefQualifierIsLValueRef 5298 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5299 D.setInvalidType(); 5300 } 5301 5302 // Rebuild the function type "R" without any type qualifiers (in 5303 // case any of the errors above fired) and with "void" as the 5304 // return type, since constructors don't have return types. 5305 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5306 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5307 return R; 5308 5309 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5310 EPI.TypeQuals = 0; 5311 EPI.RefQualifier = RQ_None; 5312 5313 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5314 Proto->getNumArgs(), EPI); 5315} 5316 5317/// CheckConstructor - Checks a fully-formed constructor for 5318/// well-formedness, issuing any diagnostics required. Returns true if 5319/// the constructor declarator is invalid. 5320void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5321 CXXRecordDecl *ClassDecl 5322 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5323 if (!ClassDecl) 5324 return Constructor->setInvalidDecl(); 5325 5326 // C++ [class.copy]p3: 5327 // A declaration of a constructor for a class X is ill-formed if 5328 // its first parameter is of type (optionally cv-qualified) X and 5329 // either there are no other parameters or else all other 5330 // parameters have default arguments. 5331 if (!Constructor->isInvalidDecl() && 5332 ((Constructor->getNumParams() == 1) || 5333 (Constructor->getNumParams() > 1 && 5334 Constructor->getParamDecl(1)->hasDefaultArg())) && 5335 Constructor->getTemplateSpecializationKind() 5336 != TSK_ImplicitInstantiation) { 5337 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5338 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5339 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5340 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5341 const char *ConstRef 5342 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5343 : " const &"; 5344 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5345 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5346 5347 // FIXME: Rather that making the constructor invalid, we should endeavor 5348 // to fix the type. 5349 Constructor->setInvalidDecl(); 5350 } 5351 } 5352} 5353 5354/// CheckDestructor - Checks a fully-formed destructor definition for 5355/// well-formedness, issuing any diagnostics required. Returns true 5356/// on error. 5357bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5358 CXXRecordDecl *RD = Destructor->getParent(); 5359 5360 if (Destructor->isVirtual()) { 5361 SourceLocation Loc; 5362 5363 if (!Destructor->isImplicit()) 5364 Loc = Destructor->getLocation(); 5365 else 5366 Loc = RD->getLocation(); 5367 5368 // If we have a virtual destructor, look up the deallocation function 5369 FunctionDecl *OperatorDelete = 0; 5370 DeclarationName Name = 5371 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5372 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5373 return true; 5374 5375 MarkDeclarationReferenced(Loc, OperatorDelete); 5376 5377 Destructor->setOperatorDelete(OperatorDelete); 5378 } 5379 5380 return false; 5381} 5382 5383static inline bool 5384FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5385 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5386 FTI.ArgInfo[0].Param && 5387 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5388} 5389 5390/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5391/// the well-formednes of the destructor declarator @p D with type @p 5392/// R. If there are any errors in the declarator, this routine will 5393/// emit diagnostics and set the declarator to invalid. Even if this happens, 5394/// will be updated to reflect a well-formed type for the destructor and 5395/// returned. 5396QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5397 StorageClass& SC) { 5398 // C++ [class.dtor]p1: 5399 // [...] A typedef-name that names a class is a class-name 5400 // (7.1.3); however, a typedef-name that names a class shall not 5401 // be used as the identifier in the declarator for a destructor 5402 // declaration. 5403 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5404 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5405 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5406 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5407 else if (const TemplateSpecializationType *TST = 5408 DeclaratorType->getAs<TemplateSpecializationType>()) 5409 if (TST->isTypeAlias()) 5410 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5411 << DeclaratorType << 1; 5412 5413 // C++ [class.dtor]p2: 5414 // A destructor is used to destroy objects of its class type. A 5415 // destructor takes no parameters, and no return type can be 5416 // specified for it (not even void). The address of a destructor 5417 // shall not be taken. A destructor shall not be static. A 5418 // destructor can be invoked for a const, volatile or const 5419 // volatile object. A destructor shall not be declared const, 5420 // volatile or const volatile (9.3.2). 5421 if (SC == SC_Static) { 5422 if (!D.isInvalidType()) 5423 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5424 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5425 << SourceRange(D.getIdentifierLoc()) 5426 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5427 5428 SC = SC_None; 5429 } 5430 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5431 // Destructors don't have return types, but the parser will 5432 // happily parse something like: 5433 // 5434 // class X { 5435 // float ~X(); 5436 // }; 5437 // 5438 // The return type will be eliminated later. 5439 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5440 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5441 << SourceRange(D.getIdentifierLoc()); 5442 } 5443 5444 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5445 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5446 if (FTI.TypeQuals & Qualifiers::Const) 5447 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5448 << "const" << SourceRange(D.getIdentifierLoc()); 5449 if (FTI.TypeQuals & Qualifiers::Volatile) 5450 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5451 << "volatile" << SourceRange(D.getIdentifierLoc()); 5452 if (FTI.TypeQuals & Qualifiers::Restrict) 5453 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5454 << "restrict" << SourceRange(D.getIdentifierLoc()); 5455 D.setInvalidType(); 5456 } 5457 5458 // C++0x [class.dtor]p2: 5459 // A destructor shall not be declared with a ref-qualifier. 5460 if (FTI.hasRefQualifier()) { 5461 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5462 << FTI.RefQualifierIsLValueRef 5463 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5464 D.setInvalidType(); 5465 } 5466 5467 // Make sure we don't have any parameters. 5468 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5469 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5470 5471 // Delete the parameters. 5472 FTI.freeArgs(); 5473 D.setInvalidType(); 5474 } 5475 5476 // Make sure the destructor isn't variadic. 5477 if (FTI.isVariadic) { 5478 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5479 D.setInvalidType(); 5480 } 5481 5482 // Rebuild the function type "R" without any type qualifiers or 5483 // parameters (in case any of the errors above fired) and with 5484 // "void" as the return type, since destructors don't have return 5485 // types. 5486 if (!D.isInvalidType()) 5487 return R; 5488 5489 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5490 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5491 EPI.Variadic = false; 5492 EPI.TypeQuals = 0; 5493 EPI.RefQualifier = RQ_None; 5494 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5495} 5496 5497/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5498/// well-formednes of the conversion function declarator @p D with 5499/// type @p R. If there are any errors in the declarator, this routine 5500/// will emit diagnostics and return true. Otherwise, it will return 5501/// false. Either way, the type @p R will be updated to reflect a 5502/// well-formed type for the conversion operator. 5503void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5504 StorageClass& SC) { 5505 // C++ [class.conv.fct]p1: 5506 // Neither parameter types nor return type can be specified. The 5507 // type of a conversion function (8.3.5) is "function taking no 5508 // parameter returning conversion-type-id." 5509 if (SC == SC_Static) { 5510 if (!D.isInvalidType()) 5511 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5512 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5513 << SourceRange(D.getIdentifierLoc()); 5514 D.setInvalidType(); 5515 SC = SC_None; 5516 } 5517 5518 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5519 5520 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5521 // Conversion functions don't have return types, but the parser will 5522 // happily parse something like: 5523 // 5524 // class X { 5525 // float operator bool(); 5526 // }; 5527 // 5528 // The return type will be changed later anyway. 5529 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5530 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5531 << SourceRange(D.getIdentifierLoc()); 5532 D.setInvalidType(); 5533 } 5534 5535 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5536 5537 // Make sure we don't have any parameters. 5538 if (Proto->getNumArgs() > 0) { 5539 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5540 5541 // Delete the parameters. 5542 D.getFunctionTypeInfo().freeArgs(); 5543 D.setInvalidType(); 5544 } else if (Proto->isVariadic()) { 5545 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5546 D.setInvalidType(); 5547 } 5548 5549 // Diagnose "&operator bool()" and other such nonsense. This 5550 // is actually a gcc extension which we don't support. 5551 if (Proto->getResultType() != ConvType) { 5552 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5553 << Proto->getResultType(); 5554 D.setInvalidType(); 5555 ConvType = Proto->getResultType(); 5556 } 5557 5558 // C++ [class.conv.fct]p4: 5559 // The conversion-type-id shall not represent a function type nor 5560 // an array type. 5561 if (ConvType->isArrayType()) { 5562 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5563 ConvType = Context.getPointerType(ConvType); 5564 D.setInvalidType(); 5565 } else if (ConvType->isFunctionType()) { 5566 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5567 ConvType = Context.getPointerType(ConvType); 5568 D.setInvalidType(); 5569 } 5570 5571 // Rebuild the function type "R" without any parameters (in case any 5572 // of the errors above fired) and with the conversion type as the 5573 // return type. 5574 if (D.isInvalidType()) 5575 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5576 5577 // C++0x explicit conversion operators. 5578 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 5579 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5580 diag::warn_explicit_conversion_functions) 5581 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5582} 5583 5584/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5585/// the declaration of the given C++ conversion function. This routine 5586/// is responsible for recording the conversion function in the C++ 5587/// class, if possible. 5588Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5589 assert(Conversion && "Expected to receive a conversion function declaration"); 5590 5591 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5592 5593 // Make sure we aren't redeclaring the conversion function. 5594 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5595 5596 // C++ [class.conv.fct]p1: 5597 // [...] A conversion function is never used to convert a 5598 // (possibly cv-qualified) object to the (possibly cv-qualified) 5599 // same object type (or a reference to it), to a (possibly 5600 // cv-qualified) base class of that type (or a reference to it), 5601 // or to (possibly cv-qualified) void. 5602 // FIXME: Suppress this warning if the conversion function ends up being a 5603 // virtual function that overrides a virtual function in a base class. 5604 QualType ClassType 5605 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5606 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5607 ConvType = ConvTypeRef->getPointeeType(); 5608 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5609 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5610 /* Suppress diagnostics for instantiations. */; 5611 else if (ConvType->isRecordType()) { 5612 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5613 if (ConvType == ClassType) 5614 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5615 << ClassType; 5616 else if (IsDerivedFrom(ClassType, ConvType)) 5617 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5618 << ClassType << ConvType; 5619 } else if (ConvType->isVoidType()) { 5620 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5621 << ClassType << ConvType; 5622 } 5623 5624 if (FunctionTemplateDecl *ConversionTemplate 5625 = Conversion->getDescribedFunctionTemplate()) 5626 return ConversionTemplate; 5627 5628 return Conversion; 5629} 5630 5631//===----------------------------------------------------------------------===// 5632// Namespace Handling 5633//===----------------------------------------------------------------------===// 5634 5635 5636 5637/// ActOnStartNamespaceDef - This is called at the start of a namespace 5638/// definition. 5639Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5640 SourceLocation InlineLoc, 5641 SourceLocation NamespaceLoc, 5642 SourceLocation IdentLoc, 5643 IdentifierInfo *II, 5644 SourceLocation LBrace, 5645 AttributeList *AttrList) { 5646 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5647 // For anonymous namespace, take the location of the left brace. 5648 SourceLocation Loc = II ? IdentLoc : LBrace; 5649 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5650 StartLoc, Loc, II); 5651 Namespc->setInline(InlineLoc.isValid()); 5652 5653 Scope *DeclRegionScope = NamespcScope->getParent(); 5654 5655 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5656 5657 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5658 PushNamespaceVisibilityAttr(Attr); 5659 5660 if (II) { 5661 // C++ [namespace.def]p2: 5662 // The identifier in an original-namespace-definition shall not 5663 // have been previously defined in the declarative region in 5664 // which the original-namespace-definition appears. The 5665 // identifier in an original-namespace-definition is the name of 5666 // the namespace. Subsequently in that declarative region, it is 5667 // treated as an original-namespace-name. 5668 // 5669 // Since namespace names are unique in their scope, and we don't 5670 // look through using directives, just look for any ordinary names. 5671 5672 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5673 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5674 Decl::IDNS_Namespace; 5675 NamedDecl *PrevDecl = 0; 5676 for (DeclContext::lookup_result R 5677 = CurContext->getRedeclContext()->lookup(II); 5678 R.first != R.second; ++R.first) { 5679 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5680 PrevDecl = *R.first; 5681 break; 5682 } 5683 } 5684 5685 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5686 // This is an extended namespace definition. 5687 if (Namespc->isInline() != OrigNS->isInline()) { 5688 // inline-ness must match 5689 if (OrigNS->isInline()) { 5690 // The user probably just forgot the 'inline', so suggest that it 5691 // be added back. 5692 Diag(Namespc->getLocation(), 5693 diag::warn_inline_namespace_reopened_noninline) 5694 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5695 } else { 5696 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5697 << Namespc->isInline(); 5698 } 5699 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5700 5701 // Recover by ignoring the new namespace's inline status. 5702 Namespc->setInline(OrigNS->isInline()); 5703 } 5704 5705 // Attach this namespace decl to the chain of extended namespace 5706 // definitions. 5707 OrigNS->setNextNamespace(Namespc); 5708 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5709 5710 // Remove the previous declaration from the scope. 5711 if (DeclRegionScope->isDeclScope(OrigNS)) { 5712 IdResolver.RemoveDecl(OrigNS); 5713 DeclRegionScope->RemoveDecl(OrigNS); 5714 } 5715 } else if (PrevDecl) { 5716 // This is an invalid name redefinition. 5717 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5718 << Namespc->getDeclName(); 5719 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5720 Namespc->setInvalidDecl(); 5721 // Continue on to push Namespc as current DeclContext and return it. 5722 } else if (II->isStr("std") && 5723 CurContext->getRedeclContext()->isTranslationUnit()) { 5724 // This is the first "real" definition of the namespace "std", so update 5725 // our cache of the "std" namespace to point at this definition. 5726 if (NamespaceDecl *StdNS = getStdNamespace()) { 5727 // We had already defined a dummy namespace "std". Link this new 5728 // namespace definition to the dummy namespace "std". 5729 StdNS->setNextNamespace(Namespc); 5730 StdNS->setLocation(IdentLoc); 5731 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5732 } 5733 5734 // Make our StdNamespace cache point at the first real definition of the 5735 // "std" namespace. 5736 StdNamespace = Namespc; 5737 5738 // Add this instance of "std" to the set of known namespaces 5739 KnownNamespaces[Namespc] = false; 5740 } else if (!Namespc->isInline()) { 5741 // Since this is an "original" namespace, add it to the known set of 5742 // namespaces if it is not an inline namespace. 5743 KnownNamespaces[Namespc] = false; 5744 } 5745 5746 PushOnScopeChains(Namespc, DeclRegionScope); 5747 } else { 5748 // Anonymous namespaces. 5749 assert(Namespc->isAnonymousNamespace()); 5750 5751 // Link the anonymous namespace into its parent. 5752 NamespaceDecl *PrevDecl; 5753 DeclContext *Parent = CurContext->getRedeclContext(); 5754 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5755 PrevDecl = TU->getAnonymousNamespace(); 5756 TU->setAnonymousNamespace(Namespc); 5757 } else { 5758 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5759 PrevDecl = ND->getAnonymousNamespace(); 5760 ND->setAnonymousNamespace(Namespc); 5761 } 5762 5763 // Link the anonymous namespace with its previous declaration. 5764 if (PrevDecl) { 5765 assert(PrevDecl->isAnonymousNamespace()); 5766 assert(!PrevDecl->getNextNamespace()); 5767 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5768 PrevDecl->setNextNamespace(Namespc); 5769 5770 if (Namespc->isInline() != PrevDecl->isInline()) { 5771 // inline-ness must match 5772 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5773 << Namespc->isInline(); 5774 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5775 Namespc->setInvalidDecl(); 5776 // Recover by ignoring the new namespace's inline status. 5777 Namespc->setInline(PrevDecl->isInline()); 5778 } 5779 } 5780 5781 CurContext->addDecl(Namespc); 5782 5783 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5784 // behaves as if it were replaced by 5785 // namespace unique { /* empty body */ } 5786 // using namespace unique; 5787 // namespace unique { namespace-body } 5788 // where all occurrences of 'unique' in a translation unit are 5789 // replaced by the same identifier and this identifier differs 5790 // from all other identifiers in the entire program. 5791 5792 // We just create the namespace with an empty name and then add an 5793 // implicit using declaration, just like the standard suggests. 5794 // 5795 // CodeGen enforces the "universally unique" aspect by giving all 5796 // declarations semantically contained within an anonymous 5797 // namespace internal linkage. 5798 5799 if (!PrevDecl) { 5800 UsingDirectiveDecl* UD 5801 = UsingDirectiveDecl::Create(Context, CurContext, 5802 /* 'using' */ LBrace, 5803 /* 'namespace' */ SourceLocation(), 5804 /* qualifier */ NestedNameSpecifierLoc(), 5805 /* identifier */ SourceLocation(), 5806 Namespc, 5807 /* Ancestor */ CurContext); 5808 UD->setImplicit(); 5809 CurContext->addDecl(UD); 5810 } 5811 } 5812 5813 // Although we could have an invalid decl (i.e. the namespace name is a 5814 // redefinition), push it as current DeclContext and try to continue parsing. 5815 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5816 // for the namespace has the declarations that showed up in that particular 5817 // namespace definition. 5818 PushDeclContext(NamespcScope, Namespc); 5819 return Namespc; 5820} 5821 5822/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5823/// is a namespace alias, returns the namespace it points to. 5824static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5825 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5826 return AD->getNamespace(); 5827 return dyn_cast_or_null<NamespaceDecl>(D); 5828} 5829 5830/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5831/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5832void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5833 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5834 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5835 Namespc->setRBraceLoc(RBrace); 5836 PopDeclContext(); 5837 if (Namespc->hasAttr<VisibilityAttr>()) 5838 PopPragmaVisibility(); 5839} 5840 5841CXXRecordDecl *Sema::getStdBadAlloc() const { 5842 return cast_or_null<CXXRecordDecl>( 5843 StdBadAlloc.get(Context.getExternalSource())); 5844} 5845 5846NamespaceDecl *Sema::getStdNamespace() const { 5847 return cast_or_null<NamespaceDecl>( 5848 StdNamespace.get(Context.getExternalSource())); 5849} 5850 5851/// \brief Retrieve the special "std" namespace, which may require us to 5852/// implicitly define the namespace. 5853NamespaceDecl *Sema::getOrCreateStdNamespace() { 5854 if (!StdNamespace) { 5855 // The "std" namespace has not yet been defined, so build one implicitly. 5856 StdNamespace = NamespaceDecl::Create(Context, 5857 Context.getTranslationUnitDecl(), 5858 SourceLocation(), SourceLocation(), 5859 &PP.getIdentifierTable().get("std")); 5860 getStdNamespace()->setImplicit(true); 5861 } 5862 5863 return getStdNamespace(); 5864} 5865 5866/// \brief Determine whether a using statement is in a context where it will be 5867/// apply in all contexts. 5868static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5869 switch (CurContext->getDeclKind()) { 5870 case Decl::TranslationUnit: 5871 return true; 5872 case Decl::LinkageSpec: 5873 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5874 default: 5875 return false; 5876 } 5877} 5878 5879static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5880 CXXScopeSpec &SS, 5881 SourceLocation IdentLoc, 5882 IdentifierInfo *Ident) { 5883 R.clear(); 5884 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5885 R.getLookupKind(), Sc, &SS, NULL, 5886 false, S.CTC_NoKeywords, NULL)) { 5887 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5888 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5889 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5890 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5891 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5892 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5893 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5894 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5895 else 5896 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5897 << Ident << CorrectedQuotedStr 5898 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5899 5900 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5901 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5902 5903 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5904 R.addDecl(Corrected.getCorrectionDecl()); 5905 return true; 5906 } 5907 R.setLookupName(Ident); 5908 } 5909 return false; 5910} 5911 5912Decl *Sema::ActOnUsingDirective(Scope *S, 5913 SourceLocation UsingLoc, 5914 SourceLocation NamespcLoc, 5915 CXXScopeSpec &SS, 5916 SourceLocation IdentLoc, 5917 IdentifierInfo *NamespcName, 5918 AttributeList *AttrList) { 5919 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5920 assert(NamespcName && "Invalid NamespcName."); 5921 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5922 5923 // This can only happen along a recovery path. 5924 while (S->getFlags() & Scope::TemplateParamScope) 5925 S = S->getParent(); 5926 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5927 5928 UsingDirectiveDecl *UDir = 0; 5929 NestedNameSpecifier *Qualifier = 0; 5930 if (SS.isSet()) 5931 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5932 5933 // Lookup namespace name. 5934 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5935 LookupParsedName(R, S, &SS); 5936 if (R.isAmbiguous()) 5937 return 0; 5938 5939 if (R.empty()) { 5940 R.clear(); 5941 // Allow "using namespace std;" or "using namespace ::std;" even if 5942 // "std" hasn't been defined yet, for GCC compatibility. 5943 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5944 NamespcName->isStr("std")) { 5945 Diag(IdentLoc, diag::ext_using_undefined_std); 5946 R.addDecl(getOrCreateStdNamespace()); 5947 R.resolveKind(); 5948 } 5949 // Otherwise, attempt typo correction. 5950 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5951 } 5952 5953 if (!R.empty()) { 5954 NamedDecl *Named = R.getFoundDecl(); 5955 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5956 && "expected namespace decl"); 5957 // C++ [namespace.udir]p1: 5958 // A using-directive specifies that the names in the nominated 5959 // namespace can be used in the scope in which the 5960 // using-directive appears after the using-directive. During 5961 // unqualified name lookup (3.4.1), the names appear as if they 5962 // were declared in the nearest enclosing namespace which 5963 // contains both the using-directive and the nominated 5964 // namespace. [Note: in this context, "contains" means "contains 5965 // directly or indirectly". ] 5966 5967 // Find enclosing context containing both using-directive and 5968 // nominated namespace. 5969 NamespaceDecl *NS = getNamespaceDecl(Named); 5970 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5971 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5972 CommonAncestor = CommonAncestor->getParent(); 5973 5974 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5975 SS.getWithLocInContext(Context), 5976 IdentLoc, Named, CommonAncestor); 5977 5978 if (IsUsingDirectiveInToplevelContext(CurContext) && 5979 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5980 Diag(IdentLoc, diag::warn_using_directive_in_header); 5981 } 5982 5983 PushUsingDirective(S, UDir); 5984 } else { 5985 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5986 } 5987 5988 // FIXME: We ignore attributes for now. 5989 return UDir; 5990} 5991 5992void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5993 // If scope has associated entity, then using directive is at namespace 5994 // or translation unit scope. We add UsingDirectiveDecls, into 5995 // it's lookup structure. 5996 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5997 Ctx->addDecl(UDir); 5998 else 5999 // Otherwise it is block-sope. using-directives will affect lookup 6000 // only to the end of scope. 6001 S->PushUsingDirective(UDir); 6002} 6003 6004 6005Decl *Sema::ActOnUsingDeclaration(Scope *S, 6006 AccessSpecifier AS, 6007 bool HasUsingKeyword, 6008 SourceLocation UsingLoc, 6009 CXXScopeSpec &SS, 6010 UnqualifiedId &Name, 6011 AttributeList *AttrList, 6012 bool IsTypeName, 6013 SourceLocation TypenameLoc) { 6014 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6015 6016 switch (Name.getKind()) { 6017 case UnqualifiedId::IK_ImplicitSelfParam: 6018 case UnqualifiedId::IK_Identifier: 6019 case UnqualifiedId::IK_OperatorFunctionId: 6020 case UnqualifiedId::IK_LiteralOperatorId: 6021 case UnqualifiedId::IK_ConversionFunctionId: 6022 break; 6023 6024 case UnqualifiedId::IK_ConstructorName: 6025 case UnqualifiedId::IK_ConstructorTemplateId: 6026 // C++0x inherited constructors. 6027 if (getLangOptions().CPlusPlus0x) break; 6028 6029 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 6030 << SS.getRange(); 6031 return 0; 6032 6033 case UnqualifiedId::IK_DestructorName: 6034 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 6035 << SS.getRange(); 6036 return 0; 6037 6038 case UnqualifiedId::IK_TemplateId: 6039 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 6040 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6041 return 0; 6042 } 6043 6044 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6045 DeclarationName TargetName = TargetNameInfo.getName(); 6046 if (!TargetName) 6047 return 0; 6048 6049 // Warn about using declarations. 6050 // TODO: store that the declaration was written without 'using' and 6051 // talk about access decls instead of using decls in the 6052 // diagnostics. 6053 if (!HasUsingKeyword) { 6054 UsingLoc = Name.getSourceRange().getBegin(); 6055 6056 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6057 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6058 } 6059 6060 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6061 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6062 return 0; 6063 6064 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6065 TargetNameInfo, AttrList, 6066 /* IsInstantiation */ false, 6067 IsTypeName, TypenameLoc); 6068 if (UD) 6069 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6070 6071 return UD; 6072} 6073 6074/// \brief Determine whether a using declaration considers the given 6075/// declarations as "equivalent", e.g., if they are redeclarations of 6076/// the same entity or are both typedefs of the same type. 6077static bool 6078IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6079 bool &SuppressRedeclaration) { 6080 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6081 SuppressRedeclaration = false; 6082 return true; 6083 } 6084 6085 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6086 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6087 SuppressRedeclaration = true; 6088 return Context.hasSameType(TD1->getUnderlyingType(), 6089 TD2->getUnderlyingType()); 6090 } 6091 6092 return false; 6093} 6094 6095 6096/// Determines whether to create a using shadow decl for a particular 6097/// decl, given the set of decls existing prior to this using lookup. 6098bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6099 const LookupResult &Previous) { 6100 // Diagnose finding a decl which is not from a base class of the 6101 // current class. We do this now because there are cases where this 6102 // function will silently decide not to build a shadow decl, which 6103 // will pre-empt further diagnostics. 6104 // 6105 // We don't need to do this in C++0x because we do the check once on 6106 // the qualifier. 6107 // 6108 // FIXME: diagnose the following if we care enough: 6109 // struct A { int foo; }; 6110 // struct B : A { using A::foo; }; 6111 // template <class T> struct C : A {}; 6112 // template <class T> struct D : C<T> { using B::foo; } // <--- 6113 // This is invalid (during instantiation) in C++03 because B::foo 6114 // resolves to the using decl in B, which is not a base class of D<T>. 6115 // We can't diagnose it immediately because C<T> is an unknown 6116 // specialization. The UsingShadowDecl in D<T> then points directly 6117 // to A::foo, which will look well-formed when we instantiate. 6118 // The right solution is to not collapse the shadow-decl chain. 6119 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 6120 DeclContext *OrigDC = Orig->getDeclContext(); 6121 6122 // Handle enums and anonymous structs. 6123 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6124 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6125 while (OrigRec->isAnonymousStructOrUnion()) 6126 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6127 6128 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6129 if (OrigDC == CurContext) { 6130 Diag(Using->getLocation(), 6131 diag::err_using_decl_nested_name_specifier_is_current_class) 6132 << Using->getQualifierLoc().getSourceRange(); 6133 Diag(Orig->getLocation(), diag::note_using_decl_target); 6134 return true; 6135 } 6136 6137 Diag(Using->getQualifierLoc().getBeginLoc(), 6138 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6139 << Using->getQualifier() 6140 << cast<CXXRecordDecl>(CurContext) 6141 << Using->getQualifierLoc().getSourceRange(); 6142 Diag(Orig->getLocation(), diag::note_using_decl_target); 6143 return true; 6144 } 6145 } 6146 6147 if (Previous.empty()) return false; 6148 6149 NamedDecl *Target = Orig; 6150 if (isa<UsingShadowDecl>(Target)) 6151 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6152 6153 // If the target happens to be one of the previous declarations, we 6154 // don't have a conflict. 6155 // 6156 // FIXME: but we might be increasing its access, in which case we 6157 // should redeclare it. 6158 NamedDecl *NonTag = 0, *Tag = 0; 6159 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6160 I != E; ++I) { 6161 NamedDecl *D = (*I)->getUnderlyingDecl(); 6162 bool Result; 6163 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6164 return Result; 6165 6166 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6167 } 6168 6169 if (Target->isFunctionOrFunctionTemplate()) { 6170 FunctionDecl *FD; 6171 if (isa<FunctionTemplateDecl>(Target)) 6172 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6173 else 6174 FD = cast<FunctionDecl>(Target); 6175 6176 NamedDecl *OldDecl = 0; 6177 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6178 case Ovl_Overload: 6179 return false; 6180 6181 case Ovl_NonFunction: 6182 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6183 break; 6184 6185 // We found a decl with the exact signature. 6186 case Ovl_Match: 6187 // If we're in a record, we want to hide the target, so we 6188 // return true (without a diagnostic) to tell the caller not to 6189 // build a shadow decl. 6190 if (CurContext->isRecord()) 6191 return true; 6192 6193 // If we're not in a record, this is an error. 6194 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6195 break; 6196 } 6197 6198 Diag(Target->getLocation(), diag::note_using_decl_target); 6199 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6200 return true; 6201 } 6202 6203 // Target is not a function. 6204 6205 if (isa<TagDecl>(Target)) { 6206 // No conflict between a tag and a non-tag. 6207 if (!Tag) return false; 6208 6209 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6210 Diag(Target->getLocation(), diag::note_using_decl_target); 6211 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6212 return true; 6213 } 6214 6215 // No conflict between a tag and a non-tag. 6216 if (!NonTag) return false; 6217 6218 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6219 Diag(Target->getLocation(), diag::note_using_decl_target); 6220 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6221 return true; 6222} 6223 6224/// Builds a shadow declaration corresponding to a 'using' declaration. 6225UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6226 UsingDecl *UD, 6227 NamedDecl *Orig) { 6228 6229 // If we resolved to another shadow declaration, just coalesce them. 6230 NamedDecl *Target = Orig; 6231 if (isa<UsingShadowDecl>(Target)) { 6232 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6233 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6234 } 6235 6236 UsingShadowDecl *Shadow 6237 = UsingShadowDecl::Create(Context, CurContext, 6238 UD->getLocation(), UD, Target); 6239 UD->addShadowDecl(Shadow); 6240 6241 Shadow->setAccess(UD->getAccess()); 6242 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6243 Shadow->setInvalidDecl(); 6244 6245 if (S) 6246 PushOnScopeChains(Shadow, S); 6247 else 6248 CurContext->addDecl(Shadow); 6249 6250 6251 return Shadow; 6252} 6253 6254/// Hides a using shadow declaration. This is required by the current 6255/// using-decl implementation when a resolvable using declaration in a 6256/// class is followed by a declaration which would hide or override 6257/// one or more of the using decl's targets; for example: 6258/// 6259/// struct Base { void foo(int); }; 6260/// struct Derived : Base { 6261/// using Base::foo; 6262/// void foo(int); 6263/// }; 6264/// 6265/// The governing language is C++03 [namespace.udecl]p12: 6266/// 6267/// When a using-declaration brings names from a base class into a 6268/// derived class scope, member functions in the derived class 6269/// override and/or hide member functions with the same name and 6270/// parameter types in a base class (rather than conflicting). 6271/// 6272/// There are two ways to implement this: 6273/// (1) optimistically create shadow decls when they're not hidden 6274/// by existing declarations, or 6275/// (2) don't create any shadow decls (or at least don't make them 6276/// visible) until we've fully parsed/instantiated the class. 6277/// The problem with (1) is that we might have to retroactively remove 6278/// a shadow decl, which requires several O(n) operations because the 6279/// decl structures are (very reasonably) not designed for removal. 6280/// (2) avoids this but is very fiddly and phase-dependent. 6281void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6282 if (Shadow->getDeclName().getNameKind() == 6283 DeclarationName::CXXConversionFunctionName) 6284 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6285 6286 // Remove it from the DeclContext... 6287 Shadow->getDeclContext()->removeDecl(Shadow); 6288 6289 // ...and the scope, if applicable... 6290 if (S) { 6291 S->RemoveDecl(Shadow); 6292 IdResolver.RemoveDecl(Shadow); 6293 } 6294 6295 // ...and the using decl. 6296 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6297 6298 // TODO: complain somehow if Shadow was used. It shouldn't 6299 // be possible for this to happen, because...? 6300} 6301 6302/// Builds a using declaration. 6303/// 6304/// \param IsInstantiation - Whether this call arises from an 6305/// instantiation of an unresolved using declaration. We treat 6306/// the lookup differently for these declarations. 6307NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6308 SourceLocation UsingLoc, 6309 CXXScopeSpec &SS, 6310 const DeclarationNameInfo &NameInfo, 6311 AttributeList *AttrList, 6312 bool IsInstantiation, 6313 bool IsTypeName, 6314 SourceLocation TypenameLoc) { 6315 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6316 SourceLocation IdentLoc = NameInfo.getLoc(); 6317 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6318 6319 // FIXME: We ignore attributes for now. 6320 6321 if (SS.isEmpty()) { 6322 Diag(IdentLoc, diag::err_using_requires_qualname); 6323 return 0; 6324 } 6325 6326 // Do the redeclaration lookup in the current scope. 6327 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6328 ForRedeclaration); 6329 Previous.setHideTags(false); 6330 if (S) { 6331 LookupName(Previous, S); 6332 6333 // It is really dumb that we have to do this. 6334 LookupResult::Filter F = Previous.makeFilter(); 6335 while (F.hasNext()) { 6336 NamedDecl *D = F.next(); 6337 if (!isDeclInScope(D, CurContext, S)) 6338 F.erase(); 6339 } 6340 F.done(); 6341 } else { 6342 assert(IsInstantiation && "no scope in non-instantiation"); 6343 assert(CurContext->isRecord() && "scope not record in instantiation"); 6344 LookupQualifiedName(Previous, CurContext); 6345 } 6346 6347 // Check for invalid redeclarations. 6348 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6349 return 0; 6350 6351 // Check for bad qualifiers. 6352 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6353 return 0; 6354 6355 DeclContext *LookupContext = computeDeclContext(SS); 6356 NamedDecl *D; 6357 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6358 if (!LookupContext) { 6359 if (IsTypeName) { 6360 // FIXME: not all declaration name kinds are legal here 6361 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6362 UsingLoc, TypenameLoc, 6363 QualifierLoc, 6364 IdentLoc, NameInfo.getName()); 6365 } else { 6366 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6367 QualifierLoc, NameInfo); 6368 } 6369 } else { 6370 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6371 NameInfo, IsTypeName); 6372 } 6373 D->setAccess(AS); 6374 CurContext->addDecl(D); 6375 6376 if (!LookupContext) return D; 6377 UsingDecl *UD = cast<UsingDecl>(D); 6378 6379 if (RequireCompleteDeclContext(SS, LookupContext)) { 6380 UD->setInvalidDecl(); 6381 return UD; 6382 } 6383 6384 // Constructor inheriting using decls get special treatment. 6385 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6386 if (CheckInheritedConstructorUsingDecl(UD)) 6387 UD->setInvalidDecl(); 6388 return UD; 6389 } 6390 6391 // Otherwise, look up the target name. 6392 6393 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6394 6395 // Unlike most lookups, we don't always want to hide tag 6396 // declarations: tag names are visible through the using declaration 6397 // even if hidden by ordinary names, *except* in a dependent context 6398 // where it's important for the sanity of two-phase lookup. 6399 if (!IsInstantiation) 6400 R.setHideTags(false); 6401 6402 LookupQualifiedName(R, LookupContext); 6403 6404 if (R.empty()) { 6405 Diag(IdentLoc, diag::err_no_member) 6406 << NameInfo.getName() << LookupContext << SS.getRange(); 6407 UD->setInvalidDecl(); 6408 return UD; 6409 } 6410 6411 if (R.isAmbiguous()) { 6412 UD->setInvalidDecl(); 6413 return UD; 6414 } 6415 6416 if (IsTypeName) { 6417 // If we asked for a typename and got a non-type decl, error out. 6418 if (!R.getAsSingle<TypeDecl>()) { 6419 Diag(IdentLoc, diag::err_using_typename_non_type); 6420 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6421 Diag((*I)->getUnderlyingDecl()->getLocation(), 6422 diag::note_using_decl_target); 6423 UD->setInvalidDecl(); 6424 return UD; 6425 } 6426 } else { 6427 // If we asked for a non-typename and we got a type, error out, 6428 // but only if this is an instantiation of an unresolved using 6429 // decl. Otherwise just silently find the type name. 6430 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6431 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6432 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6433 UD->setInvalidDecl(); 6434 return UD; 6435 } 6436 } 6437 6438 // C++0x N2914 [namespace.udecl]p6: 6439 // A using-declaration shall not name a namespace. 6440 if (R.getAsSingle<NamespaceDecl>()) { 6441 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6442 << SS.getRange(); 6443 UD->setInvalidDecl(); 6444 return UD; 6445 } 6446 6447 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6448 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6449 BuildUsingShadowDecl(S, UD, *I); 6450 } 6451 6452 return UD; 6453} 6454 6455/// Additional checks for a using declaration referring to a constructor name. 6456bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6457 if (UD->isTypeName()) { 6458 // FIXME: Cannot specify typename when specifying constructor 6459 return true; 6460 } 6461 6462 const Type *SourceType = UD->getQualifier()->getAsType(); 6463 assert(SourceType && 6464 "Using decl naming constructor doesn't have type in scope spec."); 6465 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6466 6467 // Check whether the named type is a direct base class. 6468 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6469 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6470 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6471 BaseIt != BaseE; ++BaseIt) { 6472 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6473 if (CanonicalSourceType == BaseType) 6474 break; 6475 } 6476 6477 if (BaseIt == BaseE) { 6478 // Did not find SourceType in the bases. 6479 Diag(UD->getUsingLocation(), 6480 diag::err_using_decl_constructor_not_in_direct_base) 6481 << UD->getNameInfo().getSourceRange() 6482 << QualType(SourceType, 0) << TargetClass; 6483 return true; 6484 } 6485 6486 BaseIt->setInheritConstructors(); 6487 6488 return false; 6489} 6490 6491/// Checks that the given using declaration is not an invalid 6492/// redeclaration. Note that this is checking only for the using decl 6493/// itself, not for any ill-formedness among the UsingShadowDecls. 6494bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6495 bool isTypeName, 6496 const CXXScopeSpec &SS, 6497 SourceLocation NameLoc, 6498 const LookupResult &Prev) { 6499 // C++03 [namespace.udecl]p8: 6500 // C++0x [namespace.udecl]p10: 6501 // A using-declaration is a declaration and can therefore be used 6502 // repeatedly where (and only where) multiple declarations are 6503 // allowed. 6504 // 6505 // That's in non-member contexts. 6506 if (!CurContext->getRedeclContext()->isRecord()) 6507 return false; 6508 6509 NestedNameSpecifier *Qual 6510 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6511 6512 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6513 NamedDecl *D = *I; 6514 6515 bool DTypename; 6516 NestedNameSpecifier *DQual; 6517 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6518 DTypename = UD->isTypeName(); 6519 DQual = UD->getQualifier(); 6520 } else if (UnresolvedUsingValueDecl *UD 6521 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6522 DTypename = false; 6523 DQual = UD->getQualifier(); 6524 } else if (UnresolvedUsingTypenameDecl *UD 6525 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6526 DTypename = true; 6527 DQual = UD->getQualifier(); 6528 } else continue; 6529 6530 // using decls differ if one says 'typename' and the other doesn't. 6531 // FIXME: non-dependent using decls? 6532 if (isTypeName != DTypename) continue; 6533 6534 // using decls differ if they name different scopes (but note that 6535 // template instantiation can cause this check to trigger when it 6536 // didn't before instantiation). 6537 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6538 Context.getCanonicalNestedNameSpecifier(DQual)) 6539 continue; 6540 6541 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6542 Diag(D->getLocation(), diag::note_using_decl) << 1; 6543 return true; 6544 } 6545 6546 return false; 6547} 6548 6549 6550/// Checks that the given nested-name qualifier used in a using decl 6551/// in the current context is appropriately related to the current 6552/// scope. If an error is found, diagnoses it and returns true. 6553bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6554 const CXXScopeSpec &SS, 6555 SourceLocation NameLoc) { 6556 DeclContext *NamedContext = computeDeclContext(SS); 6557 6558 if (!CurContext->isRecord()) { 6559 // C++03 [namespace.udecl]p3: 6560 // C++0x [namespace.udecl]p8: 6561 // A using-declaration for a class member shall be a member-declaration. 6562 6563 // If we weren't able to compute a valid scope, it must be a 6564 // dependent class scope. 6565 if (!NamedContext || NamedContext->isRecord()) { 6566 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6567 << SS.getRange(); 6568 return true; 6569 } 6570 6571 // Otherwise, everything is known to be fine. 6572 return false; 6573 } 6574 6575 // The current scope is a record. 6576 6577 // If the named context is dependent, we can't decide much. 6578 if (!NamedContext) { 6579 // FIXME: in C++0x, we can diagnose if we can prove that the 6580 // nested-name-specifier does not refer to a base class, which is 6581 // still possible in some cases. 6582 6583 // Otherwise we have to conservatively report that things might be 6584 // okay. 6585 return false; 6586 } 6587 6588 if (!NamedContext->isRecord()) { 6589 // Ideally this would point at the last name in the specifier, 6590 // but we don't have that level of source info. 6591 Diag(SS.getRange().getBegin(), 6592 diag::err_using_decl_nested_name_specifier_is_not_class) 6593 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6594 return true; 6595 } 6596 6597 if (!NamedContext->isDependentContext() && 6598 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6599 return true; 6600 6601 if (getLangOptions().CPlusPlus0x) { 6602 // C++0x [namespace.udecl]p3: 6603 // In a using-declaration used as a member-declaration, the 6604 // nested-name-specifier shall name a base class of the class 6605 // being defined. 6606 6607 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6608 cast<CXXRecordDecl>(NamedContext))) { 6609 if (CurContext == NamedContext) { 6610 Diag(NameLoc, 6611 diag::err_using_decl_nested_name_specifier_is_current_class) 6612 << SS.getRange(); 6613 return true; 6614 } 6615 6616 Diag(SS.getRange().getBegin(), 6617 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6618 << (NestedNameSpecifier*) SS.getScopeRep() 6619 << cast<CXXRecordDecl>(CurContext) 6620 << SS.getRange(); 6621 return true; 6622 } 6623 6624 return false; 6625 } 6626 6627 // C++03 [namespace.udecl]p4: 6628 // A using-declaration used as a member-declaration shall refer 6629 // to a member of a base class of the class being defined [etc.]. 6630 6631 // Salient point: SS doesn't have to name a base class as long as 6632 // lookup only finds members from base classes. Therefore we can 6633 // diagnose here only if we can prove that that can't happen, 6634 // i.e. if the class hierarchies provably don't intersect. 6635 6636 // TODO: it would be nice if "definitely valid" results were cached 6637 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6638 // need to be repeated. 6639 6640 struct UserData { 6641 llvm::DenseSet<const CXXRecordDecl*> Bases; 6642 6643 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6644 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6645 Data->Bases.insert(Base); 6646 return true; 6647 } 6648 6649 bool hasDependentBases(const CXXRecordDecl *Class) { 6650 return !Class->forallBases(collect, this); 6651 } 6652 6653 /// Returns true if the base is dependent or is one of the 6654 /// accumulated base classes. 6655 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6656 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6657 return !Data->Bases.count(Base); 6658 } 6659 6660 bool mightShareBases(const CXXRecordDecl *Class) { 6661 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6662 } 6663 }; 6664 6665 UserData Data; 6666 6667 // Returns false if we find a dependent base. 6668 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6669 return false; 6670 6671 // Returns false if the class has a dependent base or if it or one 6672 // of its bases is present in the base set of the current context. 6673 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6674 return false; 6675 6676 Diag(SS.getRange().getBegin(), 6677 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6678 << (NestedNameSpecifier*) SS.getScopeRep() 6679 << cast<CXXRecordDecl>(CurContext) 6680 << SS.getRange(); 6681 6682 return true; 6683} 6684 6685Decl *Sema::ActOnAliasDeclaration(Scope *S, 6686 AccessSpecifier AS, 6687 MultiTemplateParamsArg TemplateParamLists, 6688 SourceLocation UsingLoc, 6689 UnqualifiedId &Name, 6690 TypeResult Type) { 6691 // Skip up to the relevant declaration scope. 6692 while (S->getFlags() & Scope::TemplateParamScope) 6693 S = S->getParent(); 6694 assert((S->getFlags() & Scope::DeclScope) && 6695 "got alias-declaration outside of declaration scope"); 6696 6697 if (Type.isInvalid()) 6698 return 0; 6699 6700 bool Invalid = false; 6701 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6702 TypeSourceInfo *TInfo = 0; 6703 GetTypeFromParser(Type.get(), &TInfo); 6704 6705 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6706 return 0; 6707 6708 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6709 UPPC_DeclarationType)) { 6710 Invalid = true; 6711 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6712 TInfo->getTypeLoc().getBeginLoc()); 6713 } 6714 6715 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6716 LookupName(Previous, S); 6717 6718 // Warn about shadowing the name of a template parameter. 6719 if (Previous.isSingleResult() && 6720 Previous.getFoundDecl()->isTemplateParameter()) { 6721 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 6722 Previous.getFoundDecl())) 6723 Invalid = true; 6724 Previous.clear(); 6725 } 6726 6727 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6728 "name in alias declaration must be an identifier"); 6729 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6730 Name.StartLocation, 6731 Name.Identifier, TInfo); 6732 6733 NewTD->setAccess(AS); 6734 6735 if (Invalid) 6736 NewTD->setInvalidDecl(); 6737 6738 CheckTypedefForVariablyModifiedType(S, NewTD); 6739 Invalid |= NewTD->isInvalidDecl(); 6740 6741 bool Redeclaration = false; 6742 6743 NamedDecl *NewND; 6744 if (TemplateParamLists.size()) { 6745 TypeAliasTemplateDecl *OldDecl = 0; 6746 TemplateParameterList *OldTemplateParams = 0; 6747 6748 if (TemplateParamLists.size() != 1) { 6749 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6750 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6751 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6752 } 6753 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6754 6755 // Only consider previous declarations in the same scope. 6756 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6757 /*ExplicitInstantiationOrSpecialization*/false); 6758 if (!Previous.empty()) { 6759 Redeclaration = true; 6760 6761 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6762 if (!OldDecl && !Invalid) { 6763 Diag(UsingLoc, diag::err_redefinition_different_kind) 6764 << Name.Identifier; 6765 6766 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6767 if (OldD->getLocation().isValid()) 6768 Diag(OldD->getLocation(), diag::note_previous_definition); 6769 6770 Invalid = true; 6771 } 6772 6773 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6774 if (TemplateParameterListsAreEqual(TemplateParams, 6775 OldDecl->getTemplateParameters(), 6776 /*Complain=*/true, 6777 TPL_TemplateMatch)) 6778 OldTemplateParams = OldDecl->getTemplateParameters(); 6779 else 6780 Invalid = true; 6781 6782 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6783 if (!Invalid && 6784 !Context.hasSameType(OldTD->getUnderlyingType(), 6785 NewTD->getUnderlyingType())) { 6786 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6787 // but we can't reasonably accept it. 6788 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6789 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6790 if (OldTD->getLocation().isValid()) 6791 Diag(OldTD->getLocation(), diag::note_previous_definition); 6792 Invalid = true; 6793 } 6794 } 6795 } 6796 6797 // Merge any previous default template arguments into our parameters, 6798 // and check the parameter list. 6799 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6800 TPC_TypeAliasTemplate)) 6801 return 0; 6802 6803 TypeAliasTemplateDecl *NewDecl = 6804 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6805 Name.Identifier, TemplateParams, 6806 NewTD); 6807 6808 NewDecl->setAccess(AS); 6809 6810 if (Invalid) 6811 NewDecl->setInvalidDecl(); 6812 else if (OldDecl) 6813 NewDecl->setPreviousDeclaration(OldDecl); 6814 6815 NewND = NewDecl; 6816 } else { 6817 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6818 NewND = NewTD; 6819 } 6820 6821 if (!Redeclaration) 6822 PushOnScopeChains(NewND, S); 6823 6824 return NewND; 6825} 6826 6827Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6828 SourceLocation NamespaceLoc, 6829 SourceLocation AliasLoc, 6830 IdentifierInfo *Alias, 6831 CXXScopeSpec &SS, 6832 SourceLocation IdentLoc, 6833 IdentifierInfo *Ident) { 6834 6835 // Lookup the namespace name. 6836 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6837 LookupParsedName(R, S, &SS); 6838 6839 // Check if we have a previous declaration with the same name. 6840 NamedDecl *PrevDecl 6841 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6842 ForRedeclaration); 6843 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6844 PrevDecl = 0; 6845 6846 if (PrevDecl) { 6847 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6848 // We already have an alias with the same name that points to the same 6849 // namespace, so don't create a new one. 6850 // FIXME: At some point, we'll want to create the (redundant) 6851 // declaration to maintain better source information. 6852 if (!R.isAmbiguous() && !R.empty() && 6853 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6854 return 0; 6855 } 6856 6857 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6858 diag::err_redefinition_different_kind; 6859 Diag(AliasLoc, DiagID) << Alias; 6860 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6861 return 0; 6862 } 6863 6864 if (R.isAmbiguous()) 6865 return 0; 6866 6867 if (R.empty()) { 6868 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6869 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6870 return 0; 6871 } 6872 } 6873 6874 NamespaceAliasDecl *AliasDecl = 6875 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6876 Alias, SS.getWithLocInContext(Context), 6877 IdentLoc, R.getFoundDecl()); 6878 6879 PushOnScopeChains(AliasDecl, S); 6880 return AliasDecl; 6881} 6882 6883namespace { 6884 /// \brief Scoped object used to handle the state changes required in Sema 6885 /// to implicitly define the body of a C++ member function; 6886 class ImplicitlyDefinedFunctionScope { 6887 Sema &S; 6888 Sema::ContextRAII SavedContext; 6889 6890 public: 6891 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6892 : S(S), SavedContext(S, Method) 6893 { 6894 S.PushFunctionScope(); 6895 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6896 } 6897 6898 ~ImplicitlyDefinedFunctionScope() { 6899 S.PopExpressionEvaluationContext(); 6900 S.PopFunctionOrBlockScope(); 6901 } 6902 }; 6903} 6904 6905Sema::ImplicitExceptionSpecification 6906Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6907 // C++ [except.spec]p14: 6908 // An implicitly declared special member function (Clause 12) shall have an 6909 // exception-specification. [...] 6910 ImplicitExceptionSpecification ExceptSpec(Context); 6911 if (ClassDecl->isInvalidDecl()) 6912 return ExceptSpec; 6913 6914 // Direct base-class constructors. 6915 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6916 BEnd = ClassDecl->bases_end(); 6917 B != BEnd; ++B) { 6918 if (B->isVirtual()) // Handled below. 6919 continue; 6920 6921 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6922 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6923 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6924 // If this is a deleted function, add it anyway. This might be conformant 6925 // with the standard. This might not. I'm not sure. It might not matter. 6926 if (Constructor) 6927 ExceptSpec.CalledDecl(Constructor); 6928 } 6929 } 6930 6931 // Virtual base-class constructors. 6932 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6933 BEnd = ClassDecl->vbases_end(); 6934 B != BEnd; ++B) { 6935 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6936 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6937 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6938 // If this is a deleted function, add it anyway. This might be conformant 6939 // with the standard. This might not. I'm not sure. It might not matter. 6940 if (Constructor) 6941 ExceptSpec.CalledDecl(Constructor); 6942 } 6943 } 6944 6945 // Field constructors. 6946 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6947 FEnd = ClassDecl->field_end(); 6948 F != FEnd; ++F) { 6949 if (F->hasInClassInitializer()) { 6950 if (Expr *E = F->getInClassInitializer()) 6951 ExceptSpec.CalledExpr(E); 6952 else if (!F->isInvalidDecl()) 6953 ExceptSpec.SetDelayed(); 6954 } else if (const RecordType *RecordTy 6955 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6956 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6957 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6958 // If this is a deleted function, add it anyway. This might be conformant 6959 // with the standard. This might not. I'm not sure. It might not matter. 6960 // In particular, the problem is that this function never gets called. It 6961 // might just be ill-formed because this function attempts to refer to 6962 // a deleted function here. 6963 if (Constructor) 6964 ExceptSpec.CalledDecl(Constructor); 6965 } 6966 } 6967 6968 return ExceptSpec; 6969} 6970 6971CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6972 CXXRecordDecl *ClassDecl) { 6973 // C++ [class.ctor]p5: 6974 // A default constructor for a class X is a constructor of class X 6975 // that can be called without an argument. If there is no 6976 // user-declared constructor for class X, a default constructor is 6977 // implicitly declared. An implicitly-declared default constructor 6978 // is an inline public member of its class. 6979 assert(!ClassDecl->hasUserDeclaredConstructor() && 6980 "Should not build implicit default constructor!"); 6981 6982 ImplicitExceptionSpecification Spec = 6983 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6984 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6985 6986 // Create the actual constructor declaration. 6987 CanQualType ClassType 6988 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6989 SourceLocation ClassLoc = ClassDecl->getLocation(); 6990 DeclarationName Name 6991 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6992 DeclarationNameInfo NameInfo(Name, ClassLoc); 6993 CXXConstructorDecl *DefaultCon 6994 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6995 Context.getFunctionType(Context.VoidTy, 6996 0, 0, EPI), 6997 /*TInfo=*/0, 6998 /*isExplicit=*/false, 6999 /*isInline=*/true, 7000 /*isImplicitlyDeclared=*/true, 7001 // FIXME: apply the rules for definitions here 7002 /*isConstexpr=*/false); 7003 DefaultCon->setAccess(AS_public); 7004 DefaultCon->setDefaulted(); 7005 DefaultCon->setImplicit(); 7006 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7007 7008 // Note that we have declared this constructor. 7009 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7010 7011 if (Scope *S = getScopeForContext(ClassDecl)) 7012 PushOnScopeChains(DefaultCon, S, false); 7013 ClassDecl->addDecl(DefaultCon); 7014 7015 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7016 DefaultCon->setDeletedAsWritten(); 7017 7018 return DefaultCon; 7019} 7020 7021void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7022 CXXConstructorDecl *Constructor) { 7023 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7024 !Constructor->doesThisDeclarationHaveABody() && 7025 !Constructor->isDeleted()) && 7026 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7027 7028 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7029 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7030 7031 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 7032 DiagnosticErrorTrap Trap(Diags); 7033 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7034 Trap.hasErrorOccurred()) { 7035 Diag(CurrentLocation, diag::note_member_synthesized_at) 7036 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7037 Constructor->setInvalidDecl(); 7038 return; 7039 } 7040 7041 SourceLocation Loc = Constructor->getLocation(); 7042 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7043 7044 Constructor->setUsed(); 7045 MarkVTableUsed(CurrentLocation, ClassDecl); 7046 7047 if (ASTMutationListener *L = getASTMutationListener()) { 7048 L->CompletedImplicitDefinition(Constructor); 7049 } 7050} 7051 7052/// Get any existing defaulted default constructor for the given class. Do not 7053/// implicitly define one if it does not exist. 7054static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 7055 CXXRecordDecl *D) { 7056 ASTContext &Context = Self.Context; 7057 QualType ClassType = Context.getTypeDeclType(D); 7058 DeclarationName ConstructorName 7059 = Context.DeclarationNames.getCXXConstructorName( 7060 Context.getCanonicalType(ClassType.getUnqualifiedType())); 7061 7062 DeclContext::lookup_const_iterator Con, ConEnd; 7063 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 7064 Con != ConEnd; ++Con) { 7065 // A function template cannot be defaulted. 7066 if (isa<FunctionTemplateDecl>(*Con)) 7067 continue; 7068 7069 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 7070 if (Constructor->isDefaultConstructor()) 7071 return Constructor->isDefaulted() ? Constructor : 0; 7072 } 7073 return 0; 7074} 7075 7076void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7077 if (!D) return; 7078 AdjustDeclIfTemplate(D); 7079 7080 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7081 CXXConstructorDecl *CtorDecl 7082 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 7083 7084 if (!CtorDecl) return; 7085 7086 // Compute the exception specification for the default constructor. 7087 const FunctionProtoType *CtorTy = 7088 CtorDecl->getType()->castAs<FunctionProtoType>(); 7089 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 7090 ImplicitExceptionSpecification Spec = 7091 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7092 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7093 assert(EPI.ExceptionSpecType != EST_Delayed); 7094 7095 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7096 } 7097 7098 // If the default constructor is explicitly defaulted, checking the exception 7099 // specification is deferred until now. 7100 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7101 !ClassDecl->isDependentType()) 7102 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7103} 7104 7105void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7106 // We start with an initial pass over the base classes to collect those that 7107 // inherit constructors from. If there are none, we can forgo all further 7108 // processing. 7109 typedef SmallVector<const RecordType *, 4> BasesVector; 7110 BasesVector BasesToInheritFrom; 7111 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7112 BaseE = ClassDecl->bases_end(); 7113 BaseIt != BaseE; ++BaseIt) { 7114 if (BaseIt->getInheritConstructors()) { 7115 QualType Base = BaseIt->getType(); 7116 if (Base->isDependentType()) { 7117 // If we inherit constructors from anything that is dependent, just 7118 // abort processing altogether. We'll get another chance for the 7119 // instantiations. 7120 return; 7121 } 7122 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7123 } 7124 } 7125 if (BasesToInheritFrom.empty()) 7126 return; 7127 7128 // Now collect the constructors that we already have in the current class. 7129 // Those take precedence over inherited constructors. 7130 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7131 // unless there is a user-declared constructor with the same signature in 7132 // the class where the using-declaration appears. 7133 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7134 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7135 CtorE = ClassDecl->ctor_end(); 7136 CtorIt != CtorE; ++CtorIt) { 7137 ExistingConstructors.insert( 7138 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7139 } 7140 7141 Scope *S = getScopeForContext(ClassDecl); 7142 DeclarationName CreatedCtorName = 7143 Context.DeclarationNames.getCXXConstructorName( 7144 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7145 7146 // Now comes the true work. 7147 // First, we keep a map from constructor types to the base that introduced 7148 // them. Needed for finding conflicting constructors. We also keep the 7149 // actually inserted declarations in there, for pretty diagnostics. 7150 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7151 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7152 ConstructorToSourceMap InheritedConstructors; 7153 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7154 BaseE = BasesToInheritFrom.end(); 7155 BaseIt != BaseE; ++BaseIt) { 7156 const RecordType *Base = *BaseIt; 7157 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7158 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7159 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7160 CtorE = BaseDecl->ctor_end(); 7161 CtorIt != CtorE; ++CtorIt) { 7162 // Find the using declaration for inheriting this base's constructors. 7163 DeclarationName Name = 7164 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7165 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7166 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7167 SourceLocation UsingLoc = UD ? UD->getLocation() : 7168 ClassDecl->getLocation(); 7169 7170 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7171 // from the class X named in the using-declaration consists of actual 7172 // constructors and notional constructors that result from the 7173 // transformation of defaulted parameters as follows: 7174 // - all non-template default constructors of X, and 7175 // - for each non-template constructor of X that has at least one 7176 // parameter with a default argument, the set of constructors that 7177 // results from omitting any ellipsis parameter specification and 7178 // successively omitting parameters with a default argument from the 7179 // end of the parameter-type-list. 7180 CXXConstructorDecl *BaseCtor = *CtorIt; 7181 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7182 const FunctionProtoType *BaseCtorType = 7183 BaseCtor->getType()->getAs<FunctionProtoType>(); 7184 7185 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7186 maxParams = BaseCtor->getNumParams(); 7187 params <= maxParams; ++params) { 7188 // Skip default constructors. They're never inherited. 7189 if (params == 0) 7190 continue; 7191 // Skip copy and move constructors for the same reason. 7192 if (CanBeCopyOrMove && params == 1) 7193 continue; 7194 7195 // Build up a function type for this particular constructor. 7196 // FIXME: The working paper does not consider that the exception spec 7197 // for the inheriting constructor might be larger than that of the 7198 // source. This code doesn't yet, either. When it does, this code will 7199 // need to be delayed until after exception specifications and in-class 7200 // member initializers are attached. 7201 const Type *NewCtorType; 7202 if (params == maxParams) 7203 NewCtorType = BaseCtorType; 7204 else { 7205 SmallVector<QualType, 16> Args; 7206 for (unsigned i = 0; i < params; ++i) { 7207 Args.push_back(BaseCtorType->getArgType(i)); 7208 } 7209 FunctionProtoType::ExtProtoInfo ExtInfo = 7210 BaseCtorType->getExtProtoInfo(); 7211 ExtInfo.Variadic = false; 7212 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7213 Args.data(), params, ExtInfo) 7214 .getTypePtr(); 7215 } 7216 const Type *CanonicalNewCtorType = 7217 Context.getCanonicalType(NewCtorType); 7218 7219 // Now that we have the type, first check if the class already has a 7220 // constructor with this signature. 7221 if (ExistingConstructors.count(CanonicalNewCtorType)) 7222 continue; 7223 7224 // Then we check if we have already declared an inherited constructor 7225 // with this signature. 7226 std::pair<ConstructorToSourceMap::iterator, bool> result = 7227 InheritedConstructors.insert(std::make_pair( 7228 CanonicalNewCtorType, 7229 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7230 if (!result.second) { 7231 // Already in the map. If it came from a different class, that's an 7232 // error. Not if it's from the same. 7233 CanQualType PreviousBase = result.first->second.first; 7234 if (CanonicalBase != PreviousBase) { 7235 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7236 const CXXConstructorDecl *PrevBaseCtor = 7237 PrevCtor->getInheritedConstructor(); 7238 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7239 7240 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7241 Diag(BaseCtor->getLocation(), 7242 diag::note_using_decl_constructor_conflict_current_ctor); 7243 Diag(PrevBaseCtor->getLocation(), 7244 diag::note_using_decl_constructor_conflict_previous_ctor); 7245 Diag(PrevCtor->getLocation(), 7246 diag::note_using_decl_constructor_conflict_previous_using); 7247 } 7248 continue; 7249 } 7250 7251 // OK, we're there, now add the constructor. 7252 // C++0x [class.inhctor]p8: [...] that would be performed by a 7253 // user-written inline constructor [...] 7254 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7255 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7256 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7257 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7258 /*ImplicitlyDeclared=*/true, 7259 // FIXME: Due to a defect in the standard, we treat inherited 7260 // constructors as constexpr even if that makes them ill-formed. 7261 /*Constexpr=*/BaseCtor->isConstexpr()); 7262 NewCtor->setAccess(BaseCtor->getAccess()); 7263 7264 // Build up the parameter decls and add them. 7265 SmallVector<ParmVarDecl *, 16> ParamDecls; 7266 for (unsigned i = 0; i < params; ++i) { 7267 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7268 UsingLoc, UsingLoc, 7269 /*IdentifierInfo=*/0, 7270 BaseCtorType->getArgType(i), 7271 /*TInfo=*/0, SC_None, 7272 SC_None, /*DefaultArg=*/0)); 7273 } 7274 NewCtor->setParams(ParamDecls); 7275 NewCtor->setInheritedConstructor(BaseCtor); 7276 7277 PushOnScopeChains(NewCtor, S, false); 7278 ClassDecl->addDecl(NewCtor); 7279 result.first->second.second = NewCtor; 7280 } 7281 } 7282 } 7283} 7284 7285Sema::ImplicitExceptionSpecification 7286Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7287 // C++ [except.spec]p14: 7288 // An implicitly declared special member function (Clause 12) shall have 7289 // an exception-specification. 7290 ImplicitExceptionSpecification ExceptSpec(Context); 7291 if (ClassDecl->isInvalidDecl()) 7292 return ExceptSpec; 7293 7294 // Direct base-class destructors. 7295 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7296 BEnd = ClassDecl->bases_end(); 7297 B != BEnd; ++B) { 7298 if (B->isVirtual()) // Handled below. 7299 continue; 7300 7301 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7302 ExceptSpec.CalledDecl( 7303 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7304 } 7305 7306 // Virtual base-class destructors. 7307 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7308 BEnd = ClassDecl->vbases_end(); 7309 B != BEnd; ++B) { 7310 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7311 ExceptSpec.CalledDecl( 7312 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7313 } 7314 7315 // Field destructors. 7316 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7317 FEnd = ClassDecl->field_end(); 7318 F != FEnd; ++F) { 7319 if (const RecordType *RecordTy 7320 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7321 ExceptSpec.CalledDecl( 7322 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7323 } 7324 7325 return ExceptSpec; 7326} 7327 7328CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7329 // C++ [class.dtor]p2: 7330 // If a class has no user-declared destructor, a destructor is 7331 // declared implicitly. An implicitly-declared destructor is an 7332 // inline public member of its class. 7333 7334 ImplicitExceptionSpecification Spec = 7335 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7336 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7337 7338 // Create the actual destructor declaration. 7339 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7340 7341 CanQualType ClassType 7342 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7343 SourceLocation ClassLoc = ClassDecl->getLocation(); 7344 DeclarationName Name 7345 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7346 DeclarationNameInfo NameInfo(Name, ClassLoc); 7347 CXXDestructorDecl *Destructor 7348 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7349 /*isInline=*/true, 7350 /*isImplicitlyDeclared=*/true); 7351 Destructor->setAccess(AS_public); 7352 Destructor->setDefaulted(); 7353 Destructor->setImplicit(); 7354 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7355 7356 // Note that we have declared this destructor. 7357 ++ASTContext::NumImplicitDestructorsDeclared; 7358 7359 // Introduce this destructor into its scope. 7360 if (Scope *S = getScopeForContext(ClassDecl)) 7361 PushOnScopeChains(Destructor, S, false); 7362 ClassDecl->addDecl(Destructor); 7363 7364 // This could be uniqued if it ever proves significant. 7365 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7366 7367 if (ShouldDeleteDestructor(Destructor)) 7368 Destructor->setDeletedAsWritten(); 7369 7370 AddOverriddenMethods(ClassDecl, Destructor); 7371 7372 return Destructor; 7373} 7374 7375void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7376 CXXDestructorDecl *Destructor) { 7377 assert((Destructor->isDefaulted() && 7378 !Destructor->doesThisDeclarationHaveABody()) && 7379 "DefineImplicitDestructor - call it for implicit default dtor"); 7380 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7381 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7382 7383 if (Destructor->isInvalidDecl()) 7384 return; 7385 7386 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7387 7388 DiagnosticErrorTrap Trap(Diags); 7389 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7390 Destructor->getParent()); 7391 7392 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7393 Diag(CurrentLocation, diag::note_member_synthesized_at) 7394 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7395 7396 Destructor->setInvalidDecl(); 7397 return; 7398 } 7399 7400 SourceLocation Loc = Destructor->getLocation(); 7401 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7402 Destructor->setImplicitlyDefined(true); 7403 Destructor->setUsed(); 7404 MarkVTableUsed(CurrentLocation, ClassDecl); 7405 7406 if (ASTMutationListener *L = getASTMutationListener()) { 7407 L->CompletedImplicitDefinition(Destructor); 7408 } 7409} 7410 7411void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7412 CXXDestructorDecl *destructor) { 7413 // C++11 [class.dtor]p3: 7414 // A declaration of a destructor that does not have an exception- 7415 // specification is implicitly considered to have the same exception- 7416 // specification as an implicit declaration. 7417 const FunctionProtoType *dtorType = destructor->getType()-> 7418 getAs<FunctionProtoType>(); 7419 if (dtorType->hasExceptionSpec()) 7420 return; 7421 7422 ImplicitExceptionSpecification exceptSpec = 7423 ComputeDefaultedDtorExceptionSpec(classDecl); 7424 7425 // Replace the destructor's type, building off the existing one. Fortunately, 7426 // the only thing of interest in the destructor type is its extended info. 7427 // The return and arguments are fixed. 7428 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7429 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7430 epi.NumExceptions = exceptSpec.size(); 7431 epi.Exceptions = exceptSpec.data(); 7432 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7433 7434 destructor->setType(ty); 7435 7436 // FIXME: If the destructor has a body that could throw, and the newly created 7437 // spec doesn't allow exceptions, we should emit a warning, because this 7438 // change in behavior can break conforming C++03 programs at runtime. 7439 // However, we don't have a body yet, so it needs to be done somewhere else. 7440} 7441 7442/// \brief Builds a statement that copies/moves the given entity from \p From to 7443/// \c To. 7444/// 7445/// This routine is used to copy/move the members of a class with an 7446/// implicitly-declared copy/move assignment operator. When the entities being 7447/// copied are arrays, this routine builds for loops to copy them. 7448/// 7449/// \param S The Sema object used for type-checking. 7450/// 7451/// \param Loc The location where the implicit copy/move is being generated. 7452/// 7453/// \param T The type of the expressions being copied/moved. Both expressions 7454/// must have this type. 7455/// 7456/// \param To The expression we are copying/moving to. 7457/// 7458/// \param From The expression we are copying/moving from. 7459/// 7460/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7461/// Otherwise, it's a non-static member subobject. 7462/// 7463/// \param Copying Whether we're copying or moving. 7464/// 7465/// \param Depth Internal parameter recording the depth of the recursion. 7466/// 7467/// \returns A statement or a loop that copies the expressions. 7468static StmtResult 7469BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7470 Expr *To, Expr *From, 7471 bool CopyingBaseSubobject, bool Copying, 7472 unsigned Depth = 0) { 7473 // C++0x [class.copy]p28: 7474 // Each subobject is assigned in the manner appropriate to its type: 7475 // 7476 // - if the subobject is of class type, as if by a call to operator= with 7477 // the subobject as the object expression and the corresponding 7478 // subobject of x as a single function argument (as if by explicit 7479 // qualification; that is, ignoring any possible virtual overriding 7480 // functions in more derived classes); 7481 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7482 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7483 7484 // Look for operator=. 7485 DeclarationName Name 7486 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7487 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7488 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7489 7490 // Filter out any result that isn't a copy/move-assignment operator. 7491 LookupResult::Filter F = OpLookup.makeFilter(); 7492 while (F.hasNext()) { 7493 NamedDecl *D = F.next(); 7494 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7495 if (Copying ? Method->isCopyAssignmentOperator() : 7496 Method->isMoveAssignmentOperator()) 7497 continue; 7498 7499 F.erase(); 7500 } 7501 F.done(); 7502 7503 // Suppress the protected check (C++ [class.protected]) for each of the 7504 // assignment operators we found. This strange dance is required when 7505 // we're assigning via a base classes's copy-assignment operator. To 7506 // ensure that we're getting the right base class subobject (without 7507 // ambiguities), we need to cast "this" to that subobject type; to 7508 // ensure that we don't go through the virtual call mechanism, we need 7509 // to qualify the operator= name with the base class (see below). However, 7510 // this means that if the base class has a protected copy assignment 7511 // operator, the protected member access check will fail. So, we 7512 // rewrite "protected" access to "public" access in this case, since we 7513 // know by construction that we're calling from a derived class. 7514 if (CopyingBaseSubobject) { 7515 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7516 L != LEnd; ++L) { 7517 if (L.getAccess() == AS_protected) 7518 L.setAccess(AS_public); 7519 } 7520 } 7521 7522 // Create the nested-name-specifier that will be used to qualify the 7523 // reference to operator=; this is required to suppress the virtual 7524 // call mechanism. 7525 CXXScopeSpec SS; 7526 SS.MakeTrivial(S.Context, 7527 NestedNameSpecifier::Create(S.Context, 0, false, 7528 T.getTypePtr()), 7529 Loc); 7530 7531 // Create the reference to operator=. 7532 ExprResult OpEqualRef 7533 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7534 /*FirstQualifierInScope=*/0, OpLookup, 7535 /*TemplateArgs=*/0, 7536 /*SuppressQualifierCheck=*/true); 7537 if (OpEqualRef.isInvalid()) 7538 return StmtError(); 7539 7540 // Build the call to the assignment operator. 7541 7542 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7543 OpEqualRef.takeAs<Expr>(), 7544 Loc, &From, 1, Loc); 7545 if (Call.isInvalid()) 7546 return StmtError(); 7547 7548 return S.Owned(Call.takeAs<Stmt>()); 7549 } 7550 7551 // - if the subobject is of scalar type, the built-in assignment 7552 // operator is used. 7553 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7554 if (!ArrayTy) { 7555 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7556 if (Assignment.isInvalid()) 7557 return StmtError(); 7558 7559 return S.Owned(Assignment.takeAs<Stmt>()); 7560 } 7561 7562 // - if the subobject is an array, each element is assigned, in the 7563 // manner appropriate to the element type; 7564 7565 // Construct a loop over the array bounds, e.g., 7566 // 7567 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7568 // 7569 // that will copy each of the array elements. 7570 QualType SizeType = S.Context.getSizeType(); 7571 7572 // Create the iteration variable. 7573 IdentifierInfo *IterationVarName = 0; 7574 { 7575 llvm::SmallString<8> Str; 7576 llvm::raw_svector_ostream OS(Str); 7577 OS << "__i" << Depth; 7578 IterationVarName = &S.Context.Idents.get(OS.str()); 7579 } 7580 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7581 IterationVarName, SizeType, 7582 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7583 SC_None, SC_None); 7584 7585 // Initialize the iteration variable to zero. 7586 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7587 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7588 7589 // Create a reference to the iteration variable; we'll use this several 7590 // times throughout. 7591 Expr *IterationVarRef 7592 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7593 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7594 7595 // Create the DeclStmt that holds the iteration variable. 7596 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7597 7598 // Create the comparison against the array bound. 7599 llvm::APInt Upper 7600 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7601 Expr *Comparison 7602 = new (S.Context) BinaryOperator(IterationVarRef, 7603 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7604 BO_NE, S.Context.BoolTy, 7605 VK_RValue, OK_Ordinary, Loc); 7606 7607 // Create the pre-increment of the iteration variable. 7608 Expr *Increment 7609 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7610 VK_LValue, OK_Ordinary, Loc); 7611 7612 // Subscript the "from" and "to" expressions with the iteration variable. 7613 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7614 IterationVarRef, Loc)); 7615 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7616 IterationVarRef, Loc)); 7617 if (!Copying) // Cast to rvalue 7618 From = CastForMoving(S, From); 7619 7620 // Build the copy/move for an individual element of the array. 7621 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7622 To, From, CopyingBaseSubobject, 7623 Copying, Depth + 1); 7624 if (Copy.isInvalid()) 7625 return StmtError(); 7626 7627 // Construct the loop that copies all elements of this array. 7628 return S.ActOnForStmt(Loc, Loc, InitStmt, 7629 S.MakeFullExpr(Comparison), 7630 0, S.MakeFullExpr(Increment), 7631 Loc, Copy.take()); 7632} 7633 7634std::pair<Sema::ImplicitExceptionSpecification, bool> 7635Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7636 CXXRecordDecl *ClassDecl) { 7637 if (ClassDecl->isInvalidDecl()) 7638 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7639 7640 // C++ [class.copy]p10: 7641 // If the class definition does not explicitly declare a copy 7642 // assignment operator, one is declared implicitly. 7643 // The implicitly-defined copy assignment operator for a class X 7644 // will have the form 7645 // 7646 // X& X::operator=(const X&) 7647 // 7648 // if 7649 bool HasConstCopyAssignment = true; 7650 7651 // -- each direct base class B of X has a copy assignment operator 7652 // whose parameter is of type const B&, const volatile B& or B, 7653 // and 7654 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7655 BaseEnd = ClassDecl->bases_end(); 7656 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7657 // We'll handle this below 7658 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7659 continue; 7660 7661 assert(!Base->getType()->isDependentType() && 7662 "Cannot generate implicit members for class with dependent bases."); 7663 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7664 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7665 &HasConstCopyAssignment); 7666 } 7667 7668 // In C++0x, the above citation has "or virtual added" 7669 if (LangOpts.CPlusPlus0x) { 7670 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7671 BaseEnd = ClassDecl->vbases_end(); 7672 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7673 assert(!Base->getType()->isDependentType() && 7674 "Cannot generate implicit members for class with dependent bases."); 7675 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7676 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7677 &HasConstCopyAssignment); 7678 } 7679 } 7680 7681 // -- for all the nonstatic data members of X that are of a class 7682 // type M (or array thereof), each such class type has a copy 7683 // assignment operator whose parameter is of type const M&, 7684 // const volatile M& or M. 7685 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7686 FieldEnd = ClassDecl->field_end(); 7687 HasConstCopyAssignment && Field != FieldEnd; 7688 ++Field) { 7689 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7690 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7691 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7692 &HasConstCopyAssignment); 7693 } 7694 } 7695 7696 // Otherwise, the implicitly declared copy assignment operator will 7697 // have the form 7698 // 7699 // X& X::operator=(X&) 7700 7701 // C++ [except.spec]p14: 7702 // An implicitly declared special member function (Clause 12) shall have an 7703 // exception-specification. [...] 7704 7705 // It is unspecified whether or not an implicit copy assignment operator 7706 // attempts to deduplicate calls to assignment operators of virtual bases are 7707 // made. As such, this exception specification is effectively unspecified. 7708 // Based on a similar decision made for constness in C++0x, we're erring on 7709 // the side of assuming such calls to be made regardless of whether they 7710 // actually happen. 7711 ImplicitExceptionSpecification ExceptSpec(Context); 7712 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7713 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7714 BaseEnd = ClassDecl->bases_end(); 7715 Base != BaseEnd; ++Base) { 7716 if (Base->isVirtual()) 7717 continue; 7718 7719 CXXRecordDecl *BaseClassDecl 7720 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7721 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7722 ArgQuals, false, 0)) 7723 ExceptSpec.CalledDecl(CopyAssign); 7724 } 7725 7726 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7727 BaseEnd = ClassDecl->vbases_end(); 7728 Base != BaseEnd; ++Base) { 7729 CXXRecordDecl *BaseClassDecl 7730 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7731 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7732 ArgQuals, false, 0)) 7733 ExceptSpec.CalledDecl(CopyAssign); 7734 } 7735 7736 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7737 FieldEnd = ClassDecl->field_end(); 7738 Field != FieldEnd; 7739 ++Field) { 7740 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7741 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7742 if (CXXMethodDecl *CopyAssign = 7743 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7744 ExceptSpec.CalledDecl(CopyAssign); 7745 } 7746 } 7747 7748 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7749} 7750 7751CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7752 // Note: The following rules are largely analoguous to the copy 7753 // constructor rules. Note that virtual bases are not taken into account 7754 // for determining the argument type of the operator. Note also that 7755 // operators taking an object instead of a reference are allowed. 7756 7757 ImplicitExceptionSpecification Spec(Context); 7758 bool Const; 7759 llvm::tie(Spec, Const) = 7760 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7761 7762 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7763 QualType RetType = Context.getLValueReferenceType(ArgType); 7764 if (Const) 7765 ArgType = ArgType.withConst(); 7766 ArgType = Context.getLValueReferenceType(ArgType); 7767 7768 // An implicitly-declared copy assignment operator is an inline public 7769 // member of its class. 7770 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7771 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7772 SourceLocation ClassLoc = ClassDecl->getLocation(); 7773 DeclarationNameInfo NameInfo(Name, ClassLoc); 7774 CXXMethodDecl *CopyAssignment 7775 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7776 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7777 /*TInfo=*/0, /*isStatic=*/false, 7778 /*StorageClassAsWritten=*/SC_None, 7779 /*isInline=*/true, /*isConstexpr=*/false, 7780 SourceLocation()); 7781 CopyAssignment->setAccess(AS_public); 7782 CopyAssignment->setDefaulted(); 7783 CopyAssignment->setImplicit(); 7784 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7785 7786 // Add the parameter to the operator. 7787 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7788 ClassLoc, ClassLoc, /*Id=*/0, 7789 ArgType, /*TInfo=*/0, 7790 SC_None, 7791 SC_None, 0); 7792 CopyAssignment->setParams(FromParam); 7793 7794 // Note that we have added this copy-assignment operator. 7795 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7796 7797 if (Scope *S = getScopeForContext(ClassDecl)) 7798 PushOnScopeChains(CopyAssignment, S, false); 7799 ClassDecl->addDecl(CopyAssignment); 7800 7801 // C++0x [class.copy]p18: 7802 // ... If the class definition declares a move constructor or move 7803 // assignment operator, the implicitly declared copy assignment operator is 7804 // defined as deleted; ... 7805 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7806 ClassDecl->hasUserDeclaredMoveAssignment() || 7807 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7808 CopyAssignment->setDeletedAsWritten(); 7809 7810 AddOverriddenMethods(ClassDecl, CopyAssignment); 7811 return CopyAssignment; 7812} 7813 7814void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7815 CXXMethodDecl *CopyAssignOperator) { 7816 assert((CopyAssignOperator->isDefaulted() && 7817 CopyAssignOperator->isOverloadedOperator() && 7818 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7819 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7820 "DefineImplicitCopyAssignment called for wrong function"); 7821 7822 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7823 7824 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7825 CopyAssignOperator->setInvalidDecl(); 7826 return; 7827 } 7828 7829 CopyAssignOperator->setUsed(); 7830 7831 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7832 DiagnosticErrorTrap Trap(Diags); 7833 7834 // C++0x [class.copy]p30: 7835 // The implicitly-defined or explicitly-defaulted copy assignment operator 7836 // for a non-union class X performs memberwise copy assignment of its 7837 // subobjects. The direct base classes of X are assigned first, in the 7838 // order of their declaration in the base-specifier-list, and then the 7839 // immediate non-static data members of X are assigned, in the order in 7840 // which they were declared in the class definition. 7841 7842 // The statements that form the synthesized function body. 7843 ASTOwningVector<Stmt*> Statements(*this); 7844 7845 // The parameter for the "other" object, which we are copying from. 7846 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7847 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7848 QualType OtherRefType = Other->getType(); 7849 if (const LValueReferenceType *OtherRef 7850 = OtherRefType->getAs<LValueReferenceType>()) { 7851 OtherRefType = OtherRef->getPointeeType(); 7852 OtherQuals = OtherRefType.getQualifiers(); 7853 } 7854 7855 // Our location for everything implicitly-generated. 7856 SourceLocation Loc = CopyAssignOperator->getLocation(); 7857 7858 // Construct a reference to the "other" object. We'll be using this 7859 // throughout the generated ASTs. 7860 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7861 assert(OtherRef && "Reference to parameter cannot fail!"); 7862 7863 // Construct the "this" pointer. We'll be using this throughout the generated 7864 // ASTs. 7865 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7866 assert(This && "Reference to this cannot fail!"); 7867 7868 // Assign base classes. 7869 bool Invalid = false; 7870 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7871 E = ClassDecl->bases_end(); Base != E; ++Base) { 7872 // Form the assignment: 7873 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7874 QualType BaseType = Base->getType().getUnqualifiedType(); 7875 if (!BaseType->isRecordType()) { 7876 Invalid = true; 7877 continue; 7878 } 7879 7880 CXXCastPath BasePath; 7881 BasePath.push_back(Base); 7882 7883 // Construct the "from" expression, which is an implicit cast to the 7884 // appropriately-qualified base type. 7885 Expr *From = OtherRef; 7886 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7887 CK_UncheckedDerivedToBase, 7888 VK_LValue, &BasePath).take(); 7889 7890 // Dereference "this". 7891 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7892 7893 // Implicitly cast "this" to the appropriately-qualified base type. 7894 To = ImpCastExprToType(To.take(), 7895 Context.getCVRQualifiedType(BaseType, 7896 CopyAssignOperator->getTypeQualifiers()), 7897 CK_UncheckedDerivedToBase, 7898 VK_LValue, &BasePath); 7899 7900 // Build the copy. 7901 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7902 To.get(), From, 7903 /*CopyingBaseSubobject=*/true, 7904 /*Copying=*/true); 7905 if (Copy.isInvalid()) { 7906 Diag(CurrentLocation, diag::note_member_synthesized_at) 7907 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7908 CopyAssignOperator->setInvalidDecl(); 7909 return; 7910 } 7911 7912 // Success! Record the copy. 7913 Statements.push_back(Copy.takeAs<Expr>()); 7914 } 7915 7916 // \brief Reference to the __builtin_memcpy function. 7917 Expr *BuiltinMemCpyRef = 0; 7918 // \brief Reference to the __builtin_objc_memmove_collectable function. 7919 Expr *CollectableMemCpyRef = 0; 7920 7921 // Assign non-static members. 7922 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7923 FieldEnd = ClassDecl->field_end(); 7924 Field != FieldEnd; ++Field) { 7925 // Check for members of reference type; we can't copy those. 7926 if (Field->getType()->isReferenceType()) { 7927 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7928 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7929 Diag(Field->getLocation(), diag::note_declared_at); 7930 Diag(CurrentLocation, diag::note_member_synthesized_at) 7931 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7932 Invalid = true; 7933 continue; 7934 } 7935 7936 // Check for members of const-qualified, non-class type. 7937 QualType BaseType = Context.getBaseElementType(Field->getType()); 7938 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7939 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7940 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7941 Diag(Field->getLocation(), diag::note_declared_at); 7942 Diag(CurrentLocation, diag::note_member_synthesized_at) 7943 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7944 Invalid = true; 7945 continue; 7946 } 7947 7948 // Suppress assigning zero-width bitfields. 7949 if (const Expr *Width = Field->getBitWidth()) 7950 if (Width->EvaluateAsInt(Context) == 0) 7951 continue; 7952 7953 QualType FieldType = Field->getType().getNonReferenceType(); 7954 if (FieldType->isIncompleteArrayType()) { 7955 assert(ClassDecl->hasFlexibleArrayMember() && 7956 "Incomplete array type is not valid"); 7957 continue; 7958 } 7959 7960 // Build references to the field in the object we're copying from and to. 7961 CXXScopeSpec SS; // Intentionally empty 7962 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7963 LookupMemberName); 7964 MemberLookup.addDecl(*Field); 7965 MemberLookup.resolveKind(); 7966 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7967 Loc, /*IsArrow=*/false, 7968 SS, 0, MemberLookup, 0); 7969 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7970 Loc, /*IsArrow=*/true, 7971 SS, 0, MemberLookup, 0); 7972 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7973 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7974 7975 // If the field should be copied with __builtin_memcpy rather than via 7976 // explicit assignments, do so. This optimization only applies for arrays 7977 // of scalars and arrays of class type with trivial copy-assignment 7978 // operators. 7979 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7980 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7981 // Compute the size of the memory buffer to be copied. 7982 QualType SizeType = Context.getSizeType(); 7983 llvm::APInt Size(Context.getTypeSize(SizeType), 7984 Context.getTypeSizeInChars(BaseType).getQuantity()); 7985 for (const ConstantArrayType *Array 7986 = Context.getAsConstantArrayType(FieldType); 7987 Array; 7988 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7989 llvm::APInt ArraySize 7990 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7991 Size *= ArraySize; 7992 } 7993 7994 // Take the address of the field references for "from" and "to". 7995 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7996 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7997 7998 bool NeedsCollectableMemCpy = 7999 (BaseType->isRecordType() && 8000 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8001 8002 if (NeedsCollectableMemCpy) { 8003 if (!CollectableMemCpyRef) { 8004 // Create a reference to the __builtin_objc_memmove_collectable function. 8005 LookupResult R(*this, 8006 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8007 Loc, LookupOrdinaryName); 8008 LookupName(R, TUScope, true); 8009 8010 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8011 if (!CollectableMemCpy) { 8012 // Something went horribly wrong earlier, and we will have 8013 // complained about it. 8014 Invalid = true; 8015 continue; 8016 } 8017 8018 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8019 CollectableMemCpy->getType(), 8020 VK_LValue, Loc, 0).take(); 8021 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8022 } 8023 } 8024 // Create a reference to the __builtin_memcpy builtin function. 8025 else if (!BuiltinMemCpyRef) { 8026 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8027 LookupOrdinaryName); 8028 LookupName(R, TUScope, true); 8029 8030 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8031 if (!BuiltinMemCpy) { 8032 // Something went horribly wrong earlier, and we will have complained 8033 // about it. 8034 Invalid = true; 8035 continue; 8036 } 8037 8038 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8039 BuiltinMemCpy->getType(), 8040 VK_LValue, Loc, 0).take(); 8041 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8042 } 8043 8044 ASTOwningVector<Expr*> CallArgs(*this); 8045 CallArgs.push_back(To.takeAs<Expr>()); 8046 CallArgs.push_back(From.takeAs<Expr>()); 8047 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8048 ExprResult Call = ExprError(); 8049 if (NeedsCollectableMemCpy) 8050 Call = ActOnCallExpr(/*Scope=*/0, 8051 CollectableMemCpyRef, 8052 Loc, move_arg(CallArgs), 8053 Loc); 8054 else 8055 Call = ActOnCallExpr(/*Scope=*/0, 8056 BuiltinMemCpyRef, 8057 Loc, move_arg(CallArgs), 8058 Loc); 8059 8060 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8061 Statements.push_back(Call.takeAs<Expr>()); 8062 continue; 8063 } 8064 8065 // Build the copy of this field. 8066 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8067 To.get(), From.get(), 8068 /*CopyingBaseSubobject=*/false, 8069 /*Copying=*/true); 8070 if (Copy.isInvalid()) { 8071 Diag(CurrentLocation, diag::note_member_synthesized_at) 8072 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8073 CopyAssignOperator->setInvalidDecl(); 8074 return; 8075 } 8076 8077 // Success! Record the copy. 8078 Statements.push_back(Copy.takeAs<Stmt>()); 8079 } 8080 8081 if (!Invalid) { 8082 // Add a "return *this;" 8083 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8084 8085 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8086 if (Return.isInvalid()) 8087 Invalid = true; 8088 else { 8089 Statements.push_back(Return.takeAs<Stmt>()); 8090 8091 if (Trap.hasErrorOccurred()) { 8092 Diag(CurrentLocation, diag::note_member_synthesized_at) 8093 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8094 Invalid = true; 8095 } 8096 } 8097 } 8098 8099 if (Invalid) { 8100 CopyAssignOperator->setInvalidDecl(); 8101 return; 8102 } 8103 8104 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8105 /*isStmtExpr=*/false); 8106 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8107 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8108 8109 if (ASTMutationListener *L = getASTMutationListener()) { 8110 L->CompletedImplicitDefinition(CopyAssignOperator); 8111 } 8112} 8113 8114Sema::ImplicitExceptionSpecification 8115Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8116 ImplicitExceptionSpecification ExceptSpec(Context); 8117 8118 if (ClassDecl->isInvalidDecl()) 8119 return ExceptSpec; 8120 8121 // C++0x [except.spec]p14: 8122 // An implicitly declared special member function (Clause 12) shall have an 8123 // exception-specification. [...] 8124 8125 // It is unspecified whether or not an implicit move assignment operator 8126 // attempts to deduplicate calls to assignment operators of virtual bases are 8127 // made. As such, this exception specification is effectively unspecified. 8128 // Based on a similar decision made for constness in C++0x, we're erring on 8129 // the side of assuming such calls to be made regardless of whether they 8130 // actually happen. 8131 // Note that a move constructor is not implicitly declared when there are 8132 // virtual bases, but it can still be user-declared and explicitly defaulted. 8133 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8134 BaseEnd = ClassDecl->bases_end(); 8135 Base != BaseEnd; ++Base) { 8136 if (Base->isVirtual()) 8137 continue; 8138 8139 CXXRecordDecl *BaseClassDecl 8140 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8141 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8142 false, 0)) 8143 ExceptSpec.CalledDecl(MoveAssign); 8144 } 8145 8146 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8147 BaseEnd = ClassDecl->vbases_end(); 8148 Base != BaseEnd; ++Base) { 8149 CXXRecordDecl *BaseClassDecl 8150 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8151 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8152 false, 0)) 8153 ExceptSpec.CalledDecl(MoveAssign); 8154 } 8155 8156 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8157 FieldEnd = ClassDecl->field_end(); 8158 Field != FieldEnd; 8159 ++Field) { 8160 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8161 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8162 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8163 false, 0)) 8164 ExceptSpec.CalledDecl(MoveAssign); 8165 } 8166 } 8167 8168 return ExceptSpec; 8169} 8170 8171CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8172 // Note: The following rules are largely analoguous to the move 8173 // constructor rules. 8174 8175 ImplicitExceptionSpecification Spec( 8176 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8177 8178 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8179 QualType RetType = Context.getLValueReferenceType(ArgType); 8180 ArgType = Context.getRValueReferenceType(ArgType); 8181 8182 // An implicitly-declared move assignment operator is an inline public 8183 // member of its class. 8184 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8185 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8186 SourceLocation ClassLoc = ClassDecl->getLocation(); 8187 DeclarationNameInfo NameInfo(Name, ClassLoc); 8188 CXXMethodDecl *MoveAssignment 8189 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8190 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8191 /*TInfo=*/0, /*isStatic=*/false, 8192 /*StorageClassAsWritten=*/SC_None, 8193 /*isInline=*/true, 8194 /*isConstexpr=*/false, 8195 SourceLocation()); 8196 MoveAssignment->setAccess(AS_public); 8197 MoveAssignment->setDefaulted(); 8198 MoveAssignment->setImplicit(); 8199 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8200 8201 // Add the parameter to the operator. 8202 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8203 ClassLoc, ClassLoc, /*Id=*/0, 8204 ArgType, /*TInfo=*/0, 8205 SC_None, 8206 SC_None, 0); 8207 MoveAssignment->setParams(FromParam); 8208 8209 // Note that we have added this copy-assignment operator. 8210 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8211 8212 // C++0x [class.copy]p9: 8213 // If the definition of a class X does not explicitly declare a move 8214 // assignment operator, one will be implicitly declared as defaulted if and 8215 // only if: 8216 // [...] 8217 // - the move assignment operator would not be implicitly defined as 8218 // deleted. 8219 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8220 // Cache this result so that we don't try to generate this over and over 8221 // on every lookup, leaking memory and wasting time. 8222 ClassDecl->setFailedImplicitMoveAssignment(); 8223 return 0; 8224 } 8225 8226 if (Scope *S = getScopeForContext(ClassDecl)) 8227 PushOnScopeChains(MoveAssignment, S, false); 8228 ClassDecl->addDecl(MoveAssignment); 8229 8230 AddOverriddenMethods(ClassDecl, MoveAssignment); 8231 return MoveAssignment; 8232} 8233 8234void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8235 CXXMethodDecl *MoveAssignOperator) { 8236 assert((MoveAssignOperator->isDefaulted() && 8237 MoveAssignOperator->isOverloadedOperator() && 8238 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8239 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8240 "DefineImplicitMoveAssignment called for wrong function"); 8241 8242 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8243 8244 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8245 MoveAssignOperator->setInvalidDecl(); 8246 return; 8247 } 8248 8249 MoveAssignOperator->setUsed(); 8250 8251 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8252 DiagnosticErrorTrap Trap(Diags); 8253 8254 // C++0x [class.copy]p28: 8255 // The implicitly-defined or move assignment operator for a non-union class 8256 // X performs memberwise move assignment of its subobjects. The direct base 8257 // classes of X are assigned first, in the order of their declaration in the 8258 // base-specifier-list, and then the immediate non-static data members of X 8259 // are assigned, in the order in which they were declared in the class 8260 // definition. 8261 8262 // The statements that form the synthesized function body. 8263 ASTOwningVector<Stmt*> Statements(*this); 8264 8265 // The parameter for the "other" object, which we are move from. 8266 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8267 QualType OtherRefType = Other->getType()-> 8268 getAs<RValueReferenceType>()->getPointeeType(); 8269 assert(OtherRefType.getQualifiers() == 0 && 8270 "Bad argument type of defaulted move assignment"); 8271 8272 // Our location for everything implicitly-generated. 8273 SourceLocation Loc = MoveAssignOperator->getLocation(); 8274 8275 // Construct a reference to the "other" object. We'll be using this 8276 // throughout the generated ASTs. 8277 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8278 assert(OtherRef && "Reference to parameter cannot fail!"); 8279 // Cast to rvalue. 8280 OtherRef = CastForMoving(*this, OtherRef); 8281 8282 // Construct the "this" pointer. We'll be using this throughout the generated 8283 // ASTs. 8284 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8285 assert(This && "Reference to this cannot fail!"); 8286 8287 // Assign base classes. 8288 bool Invalid = false; 8289 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8290 E = ClassDecl->bases_end(); Base != E; ++Base) { 8291 // Form the assignment: 8292 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8293 QualType BaseType = Base->getType().getUnqualifiedType(); 8294 if (!BaseType->isRecordType()) { 8295 Invalid = true; 8296 continue; 8297 } 8298 8299 CXXCastPath BasePath; 8300 BasePath.push_back(Base); 8301 8302 // Construct the "from" expression, which is an implicit cast to the 8303 // appropriately-qualified base type. 8304 Expr *From = OtherRef; 8305 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8306 VK_XValue, &BasePath).take(); 8307 8308 // Dereference "this". 8309 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8310 8311 // Implicitly cast "this" to the appropriately-qualified base type. 8312 To = ImpCastExprToType(To.take(), 8313 Context.getCVRQualifiedType(BaseType, 8314 MoveAssignOperator->getTypeQualifiers()), 8315 CK_UncheckedDerivedToBase, 8316 VK_LValue, &BasePath); 8317 8318 // Build the move. 8319 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8320 To.get(), From, 8321 /*CopyingBaseSubobject=*/true, 8322 /*Copying=*/false); 8323 if (Move.isInvalid()) { 8324 Diag(CurrentLocation, diag::note_member_synthesized_at) 8325 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8326 MoveAssignOperator->setInvalidDecl(); 8327 return; 8328 } 8329 8330 // Success! Record the move. 8331 Statements.push_back(Move.takeAs<Expr>()); 8332 } 8333 8334 // \brief Reference to the __builtin_memcpy function. 8335 Expr *BuiltinMemCpyRef = 0; 8336 // \brief Reference to the __builtin_objc_memmove_collectable function. 8337 Expr *CollectableMemCpyRef = 0; 8338 8339 // Assign non-static members. 8340 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8341 FieldEnd = ClassDecl->field_end(); 8342 Field != FieldEnd; ++Field) { 8343 // Check for members of reference type; we can't move those. 8344 if (Field->getType()->isReferenceType()) { 8345 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8346 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8347 Diag(Field->getLocation(), diag::note_declared_at); 8348 Diag(CurrentLocation, diag::note_member_synthesized_at) 8349 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8350 Invalid = true; 8351 continue; 8352 } 8353 8354 // Check for members of const-qualified, non-class type. 8355 QualType BaseType = Context.getBaseElementType(Field->getType()); 8356 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8357 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8358 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8359 Diag(Field->getLocation(), diag::note_declared_at); 8360 Diag(CurrentLocation, diag::note_member_synthesized_at) 8361 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8362 Invalid = true; 8363 continue; 8364 } 8365 8366 // Suppress assigning zero-width bitfields. 8367 if (const Expr *Width = Field->getBitWidth()) 8368 if (Width->EvaluateAsInt(Context) == 0) 8369 continue; 8370 8371 QualType FieldType = Field->getType().getNonReferenceType(); 8372 if (FieldType->isIncompleteArrayType()) { 8373 assert(ClassDecl->hasFlexibleArrayMember() && 8374 "Incomplete array type is not valid"); 8375 continue; 8376 } 8377 8378 // Build references to the field in the object we're copying from and to. 8379 CXXScopeSpec SS; // Intentionally empty 8380 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8381 LookupMemberName); 8382 MemberLookup.addDecl(*Field); 8383 MemberLookup.resolveKind(); 8384 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8385 Loc, /*IsArrow=*/false, 8386 SS, 0, MemberLookup, 0); 8387 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8388 Loc, /*IsArrow=*/true, 8389 SS, 0, MemberLookup, 0); 8390 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8391 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8392 8393 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8394 "Member reference with rvalue base must be rvalue except for reference " 8395 "members, which aren't allowed for move assignment."); 8396 8397 // If the field should be copied with __builtin_memcpy rather than via 8398 // explicit assignments, do so. This optimization only applies for arrays 8399 // of scalars and arrays of class type with trivial move-assignment 8400 // operators. 8401 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8402 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8403 // Compute the size of the memory buffer to be copied. 8404 QualType SizeType = Context.getSizeType(); 8405 llvm::APInt Size(Context.getTypeSize(SizeType), 8406 Context.getTypeSizeInChars(BaseType).getQuantity()); 8407 for (const ConstantArrayType *Array 8408 = Context.getAsConstantArrayType(FieldType); 8409 Array; 8410 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8411 llvm::APInt ArraySize 8412 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8413 Size *= ArraySize; 8414 } 8415 8416 // Take the address of the field references for "from" and "to". We 8417 // directly construct UnaryOperators here because semantic analysis 8418 // does not permit us to take the address of an xvalue. 8419 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8420 Context.getPointerType(From.get()->getType()), 8421 VK_RValue, OK_Ordinary, Loc); 8422 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8423 Context.getPointerType(To.get()->getType()), 8424 VK_RValue, OK_Ordinary, Loc); 8425 8426 bool NeedsCollectableMemCpy = 8427 (BaseType->isRecordType() && 8428 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8429 8430 if (NeedsCollectableMemCpy) { 8431 if (!CollectableMemCpyRef) { 8432 // Create a reference to the __builtin_objc_memmove_collectable function. 8433 LookupResult R(*this, 8434 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8435 Loc, LookupOrdinaryName); 8436 LookupName(R, TUScope, true); 8437 8438 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8439 if (!CollectableMemCpy) { 8440 // Something went horribly wrong earlier, and we will have 8441 // complained about it. 8442 Invalid = true; 8443 continue; 8444 } 8445 8446 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8447 CollectableMemCpy->getType(), 8448 VK_LValue, Loc, 0).take(); 8449 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8450 } 8451 } 8452 // Create a reference to the __builtin_memcpy builtin function. 8453 else if (!BuiltinMemCpyRef) { 8454 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8455 LookupOrdinaryName); 8456 LookupName(R, TUScope, true); 8457 8458 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8459 if (!BuiltinMemCpy) { 8460 // Something went horribly wrong earlier, and we will have complained 8461 // about it. 8462 Invalid = true; 8463 continue; 8464 } 8465 8466 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8467 BuiltinMemCpy->getType(), 8468 VK_LValue, Loc, 0).take(); 8469 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8470 } 8471 8472 ASTOwningVector<Expr*> CallArgs(*this); 8473 CallArgs.push_back(To.takeAs<Expr>()); 8474 CallArgs.push_back(From.takeAs<Expr>()); 8475 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8476 ExprResult Call = ExprError(); 8477 if (NeedsCollectableMemCpy) 8478 Call = ActOnCallExpr(/*Scope=*/0, 8479 CollectableMemCpyRef, 8480 Loc, move_arg(CallArgs), 8481 Loc); 8482 else 8483 Call = ActOnCallExpr(/*Scope=*/0, 8484 BuiltinMemCpyRef, 8485 Loc, move_arg(CallArgs), 8486 Loc); 8487 8488 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8489 Statements.push_back(Call.takeAs<Expr>()); 8490 continue; 8491 } 8492 8493 // Build the move of this field. 8494 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8495 To.get(), From.get(), 8496 /*CopyingBaseSubobject=*/false, 8497 /*Copying=*/false); 8498 if (Move.isInvalid()) { 8499 Diag(CurrentLocation, diag::note_member_synthesized_at) 8500 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8501 MoveAssignOperator->setInvalidDecl(); 8502 return; 8503 } 8504 8505 // Success! Record the copy. 8506 Statements.push_back(Move.takeAs<Stmt>()); 8507 } 8508 8509 if (!Invalid) { 8510 // Add a "return *this;" 8511 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8512 8513 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8514 if (Return.isInvalid()) 8515 Invalid = true; 8516 else { 8517 Statements.push_back(Return.takeAs<Stmt>()); 8518 8519 if (Trap.hasErrorOccurred()) { 8520 Diag(CurrentLocation, diag::note_member_synthesized_at) 8521 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8522 Invalid = true; 8523 } 8524 } 8525 } 8526 8527 if (Invalid) { 8528 MoveAssignOperator->setInvalidDecl(); 8529 return; 8530 } 8531 8532 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8533 /*isStmtExpr=*/false); 8534 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8535 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8536 8537 if (ASTMutationListener *L = getASTMutationListener()) { 8538 L->CompletedImplicitDefinition(MoveAssignOperator); 8539 } 8540} 8541 8542std::pair<Sema::ImplicitExceptionSpecification, bool> 8543Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8544 if (ClassDecl->isInvalidDecl()) 8545 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8546 8547 // C++ [class.copy]p5: 8548 // The implicitly-declared copy constructor for a class X will 8549 // have the form 8550 // 8551 // X::X(const X&) 8552 // 8553 // if 8554 // FIXME: It ought to be possible to store this on the record. 8555 bool HasConstCopyConstructor = true; 8556 8557 // -- each direct or virtual base class B of X has a copy 8558 // constructor whose first parameter is of type const B& or 8559 // const volatile B&, and 8560 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8561 BaseEnd = ClassDecl->bases_end(); 8562 HasConstCopyConstructor && Base != BaseEnd; 8563 ++Base) { 8564 // Virtual bases are handled below. 8565 if (Base->isVirtual()) 8566 continue; 8567 8568 CXXRecordDecl *BaseClassDecl 8569 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8570 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8571 &HasConstCopyConstructor); 8572 } 8573 8574 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8575 BaseEnd = ClassDecl->vbases_end(); 8576 HasConstCopyConstructor && Base != BaseEnd; 8577 ++Base) { 8578 CXXRecordDecl *BaseClassDecl 8579 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8580 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8581 &HasConstCopyConstructor); 8582 } 8583 8584 // -- for all the nonstatic data members of X that are of a 8585 // class type M (or array thereof), each such class type 8586 // has a copy constructor whose first parameter is of type 8587 // const M& or const volatile M&. 8588 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8589 FieldEnd = ClassDecl->field_end(); 8590 HasConstCopyConstructor && Field != FieldEnd; 8591 ++Field) { 8592 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8593 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8594 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8595 &HasConstCopyConstructor); 8596 } 8597 } 8598 // Otherwise, the implicitly declared copy constructor will have 8599 // the form 8600 // 8601 // X::X(X&) 8602 8603 // C++ [except.spec]p14: 8604 // An implicitly declared special member function (Clause 12) shall have an 8605 // exception-specification. [...] 8606 ImplicitExceptionSpecification ExceptSpec(Context); 8607 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8608 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8609 BaseEnd = ClassDecl->bases_end(); 8610 Base != BaseEnd; 8611 ++Base) { 8612 // Virtual bases are handled below. 8613 if (Base->isVirtual()) 8614 continue; 8615 8616 CXXRecordDecl *BaseClassDecl 8617 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8618 if (CXXConstructorDecl *CopyConstructor = 8619 LookupCopyingConstructor(BaseClassDecl, Quals)) 8620 ExceptSpec.CalledDecl(CopyConstructor); 8621 } 8622 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8623 BaseEnd = ClassDecl->vbases_end(); 8624 Base != BaseEnd; 8625 ++Base) { 8626 CXXRecordDecl *BaseClassDecl 8627 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8628 if (CXXConstructorDecl *CopyConstructor = 8629 LookupCopyingConstructor(BaseClassDecl, Quals)) 8630 ExceptSpec.CalledDecl(CopyConstructor); 8631 } 8632 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8633 FieldEnd = ClassDecl->field_end(); 8634 Field != FieldEnd; 8635 ++Field) { 8636 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8637 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8638 if (CXXConstructorDecl *CopyConstructor = 8639 LookupCopyingConstructor(FieldClassDecl, Quals)) 8640 ExceptSpec.CalledDecl(CopyConstructor); 8641 } 8642 } 8643 8644 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8645} 8646 8647CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8648 CXXRecordDecl *ClassDecl) { 8649 // C++ [class.copy]p4: 8650 // If the class definition does not explicitly declare a copy 8651 // constructor, one is declared implicitly. 8652 8653 ImplicitExceptionSpecification Spec(Context); 8654 bool Const; 8655 llvm::tie(Spec, Const) = 8656 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8657 8658 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8659 QualType ArgType = ClassType; 8660 if (Const) 8661 ArgType = ArgType.withConst(); 8662 ArgType = Context.getLValueReferenceType(ArgType); 8663 8664 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8665 8666 DeclarationName Name 8667 = Context.DeclarationNames.getCXXConstructorName( 8668 Context.getCanonicalType(ClassType)); 8669 SourceLocation ClassLoc = ClassDecl->getLocation(); 8670 DeclarationNameInfo NameInfo(Name, ClassLoc); 8671 8672 // An implicitly-declared copy constructor is an inline public 8673 // member of its class. 8674 CXXConstructorDecl *CopyConstructor 8675 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8676 Context.getFunctionType(Context.VoidTy, 8677 &ArgType, 1, EPI), 8678 /*TInfo=*/0, 8679 /*isExplicit=*/false, 8680 /*isInline=*/true, 8681 /*isImplicitlyDeclared=*/true, 8682 // FIXME: apply the rules for definitions here 8683 /*isConstexpr=*/false); 8684 CopyConstructor->setAccess(AS_public); 8685 CopyConstructor->setDefaulted(); 8686 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8687 8688 // Note that we have declared this constructor. 8689 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8690 8691 // Add the parameter to the constructor. 8692 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8693 ClassLoc, ClassLoc, 8694 /*IdentifierInfo=*/0, 8695 ArgType, /*TInfo=*/0, 8696 SC_None, 8697 SC_None, 0); 8698 CopyConstructor->setParams(FromParam); 8699 8700 if (Scope *S = getScopeForContext(ClassDecl)) 8701 PushOnScopeChains(CopyConstructor, S, false); 8702 ClassDecl->addDecl(CopyConstructor); 8703 8704 // C++0x [class.copy]p7: 8705 // ... If the class definition declares a move constructor or move 8706 // assignment operator, the implicitly declared constructor is defined as 8707 // deleted; ... 8708 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8709 ClassDecl->hasUserDeclaredMoveAssignment() || 8710 ShouldDeleteCopyConstructor(CopyConstructor)) 8711 CopyConstructor->setDeletedAsWritten(); 8712 8713 return CopyConstructor; 8714} 8715 8716void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8717 CXXConstructorDecl *CopyConstructor) { 8718 assert((CopyConstructor->isDefaulted() && 8719 CopyConstructor->isCopyConstructor() && 8720 !CopyConstructor->doesThisDeclarationHaveABody()) && 8721 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8722 8723 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8724 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8725 8726 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8727 DiagnosticErrorTrap Trap(Diags); 8728 8729 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8730 Trap.hasErrorOccurred()) { 8731 Diag(CurrentLocation, diag::note_member_synthesized_at) 8732 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8733 CopyConstructor->setInvalidDecl(); 8734 } else { 8735 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8736 CopyConstructor->getLocation(), 8737 MultiStmtArg(*this, 0, 0), 8738 /*isStmtExpr=*/false) 8739 .takeAs<Stmt>()); 8740 CopyConstructor->setImplicitlyDefined(true); 8741 } 8742 8743 CopyConstructor->setUsed(); 8744 if (ASTMutationListener *L = getASTMutationListener()) { 8745 L->CompletedImplicitDefinition(CopyConstructor); 8746 } 8747} 8748 8749Sema::ImplicitExceptionSpecification 8750Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8751 // C++ [except.spec]p14: 8752 // An implicitly declared special member function (Clause 12) shall have an 8753 // exception-specification. [...] 8754 ImplicitExceptionSpecification ExceptSpec(Context); 8755 if (ClassDecl->isInvalidDecl()) 8756 return ExceptSpec; 8757 8758 // Direct base-class constructors. 8759 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8760 BEnd = ClassDecl->bases_end(); 8761 B != BEnd; ++B) { 8762 if (B->isVirtual()) // Handled below. 8763 continue; 8764 8765 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8766 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8767 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8768 // If this is a deleted function, add it anyway. This might be conformant 8769 // with the standard. This might not. I'm not sure. It might not matter. 8770 if (Constructor) 8771 ExceptSpec.CalledDecl(Constructor); 8772 } 8773 } 8774 8775 // Virtual base-class constructors. 8776 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8777 BEnd = ClassDecl->vbases_end(); 8778 B != BEnd; ++B) { 8779 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8780 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8781 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8782 // If this is a deleted function, add it anyway. This might be conformant 8783 // with the standard. This might not. I'm not sure. It might not matter. 8784 if (Constructor) 8785 ExceptSpec.CalledDecl(Constructor); 8786 } 8787 } 8788 8789 // Field constructors. 8790 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8791 FEnd = ClassDecl->field_end(); 8792 F != FEnd; ++F) { 8793 if (F->hasInClassInitializer()) { 8794 if (Expr *E = F->getInClassInitializer()) 8795 ExceptSpec.CalledExpr(E); 8796 else if (!F->isInvalidDecl()) 8797 ExceptSpec.SetDelayed(); 8798 } else if (const RecordType *RecordTy 8799 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8800 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8801 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8802 // If this is a deleted function, add it anyway. This might be conformant 8803 // with the standard. This might not. I'm not sure. It might not matter. 8804 // In particular, the problem is that this function never gets called. It 8805 // might just be ill-formed because this function attempts to refer to 8806 // a deleted function here. 8807 if (Constructor) 8808 ExceptSpec.CalledDecl(Constructor); 8809 } 8810 } 8811 8812 return ExceptSpec; 8813} 8814 8815CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8816 CXXRecordDecl *ClassDecl) { 8817 ImplicitExceptionSpecification Spec( 8818 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8819 8820 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8821 QualType ArgType = Context.getRValueReferenceType(ClassType); 8822 8823 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8824 8825 DeclarationName Name 8826 = Context.DeclarationNames.getCXXConstructorName( 8827 Context.getCanonicalType(ClassType)); 8828 SourceLocation ClassLoc = ClassDecl->getLocation(); 8829 DeclarationNameInfo NameInfo(Name, ClassLoc); 8830 8831 // C++0x [class.copy]p11: 8832 // An implicitly-declared copy/move constructor is an inline public 8833 // member of its class. 8834 CXXConstructorDecl *MoveConstructor 8835 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8836 Context.getFunctionType(Context.VoidTy, 8837 &ArgType, 1, EPI), 8838 /*TInfo=*/0, 8839 /*isExplicit=*/false, 8840 /*isInline=*/true, 8841 /*isImplicitlyDeclared=*/true, 8842 // FIXME: apply the rules for definitions here 8843 /*isConstexpr=*/false); 8844 MoveConstructor->setAccess(AS_public); 8845 MoveConstructor->setDefaulted(); 8846 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8847 8848 // Add the parameter to the constructor. 8849 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8850 ClassLoc, ClassLoc, 8851 /*IdentifierInfo=*/0, 8852 ArgType, /*TInfo=*/0, 8853 SC_None, 8854 SC_None, 0); 8855 MoveConstructor->setParams(FromParam); 8856 8857 // C++0x [class.copy]p9: 8858 // If the definition of a class X does not explicitly declare a move 8859 // constructor, one will be implicitly declared as defaulted if and only if: 8860 // [...] 8861 // - the move constructor would not be implicitly defined as deleted. 8862 if (ShouldDeleteMoveConstructor(MoveConstructor)) { 8863 // Cache this result so that we don't try to generate this over and over 8864 // on every lookup, leaking memory and wasting time. 8865 ClassDecl->setFailedImplicitMoveConstructor(); 8866 return 0; 8867 } 8868 8869 // Note that we have declared this constructor. 8870 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8871 8872 if (Scope *S = getScopeForContext(ClassDecl)) 8873 PushOnScopeChains(MoveConstructor, S, false); 8874 ClassDecl->addDecl(MoveConstructor); 8875 8876 return MoveConstructor; 8877} 8878 8879void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8880 CXXConstructorDecl *MoveConstructor) { 8881 assert((MoveConstructor->isDefaulted() && 8882 MoveConstructor->isMoveConstructor() && 8883 !MoveConstructor->doesThisDeclarationHaveABody()) && 8884 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8885 8886 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8887 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8888 8889 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8890 DiagnosticErrorTrap Trap(Diags); 8891 8892 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8893 Trap.hasErrorOccurred()) { 8894 Diag(CurrentLocation, diag::note_member_synthesized_at) 8895 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8896 MoveConstructor->setInvalidDecl(); 8897 } else { 8898 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8899 MoveConstructor->getLocation(), 8900 MultiStmtArg(*this, 0, 0), 8901 /*isStmtExpr=*/false) 8902 .takeAs<Stmt>()); 8903 MoveConstructor->setImplicitlyDefined(true); 8904 } 8905 8906 MoveConstructor->setUsed(); 8907 8908 if (ASTMutationListener *L = getASTMutationListener()) { 8909 L->CompletedImplicitDefinition(MoveConstructor); 8910 } 8911} 8912 8913ExprResult 8914Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8915 CXXConstructorDecl *Constructor, 8916 MultiExprArg ExprArgs, 8917 bool HadMultipleCandidates, 8918 bool RequiresZeroInit, 8919 unsigned ConstructKind, 8920 SourceRange ParenRange) { 8921 bool Elidable = false; 8922 8923 // C++0x [class.copy]p34: 8924 // When certain criteria are met, an implementation is allowed to 8925 // omit the copy/move construction of a class object, even if the 8926 // copy/move constructor and/or destructor for the object have 8927 // side effects. [...] 8928 // - when a temporary class object that has not been bound to a 8929 // reference (12.2) would be copied/moved to a class object 8930 // with the same cv-unqualified type, the copy/move operation 8931 // can be omitted by constructing the temporary object 8932 // directly into the target of the omitted copy/move 8933 if (ConstructKind == CXXConstructExpr::CK_Complete && 8934 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8935 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8936 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8937 } 8938 8939 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8940 Elidable, move(ExprArgs), HadMultipleCandidates, 8941 RequiresZeroInit, ConstructKind, ParenRange); 8942} 8943 8944/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8945/// including handling of its default argument expressions. 8946ExprResult 8947Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8948 CXXConstructorDecl *Constructor, bool Elidable, 8949 MultiExprArg ExprArgs, 8950 bool HadMultipleCandidates, 8951 bool RequiresZeroInit, 8952 unsigned ConstructKind, 8953 SourceRange ParenRange) { 8954 unsigned NumExprs = ExprArgs.size(); 8955 Expr **Exprs = (Expr **)ExprArgs.release(); 8956 8957 for (specific_attr_iterator<NonNullAttr> 8958 i = Constructor->specific_attr_begin<NonNullAttr>(), 8959 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8960 const NonNullAttr *NonNull = *i; 8961 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8962 } 8963 8964 MarkDeclarationReferenced(ConstructLoc, Constructor); 8965 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8966 Constructor, Elidable, Exprs, NumExprs, 8967 HadMultipleCandidates, RequiresZeroInit, 8968 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8969 ParenRange)); 8970} 8971 8972bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8973 CXXConstructorDecl *Constructor, 8974 MultiExprArg Exprs, 8975 bool HadMultipleCandidates) { 8976 // FIXME: Provide the correct paren SourceRange when available. 8977 ExprResult TempResult = 8978 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8979 move(Exprs), HadMultipleCandidates, false, 8980 CXXConstructExpr::CK_Complete, SourceRange()); 8981 if (TempResult.isInvalid()) 8982 return true; 8983 8984 Expr *Temp = TempResult.takeAs<Expr>(); 8985 CheckImplicitConversions(Temp, VD->getLocation()); 8986 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8987 Temp = MaybeCreateExprWithCleanups(Temp); 8988 VD->setInit(Temp); 8989 8990 return false; 8991} 8992 8993void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8994 if (VD->isInvalidDecl()) return; 8995 8996 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8997 if (ClassDecl->isInvalidDecl()) return; 8998 if (ClassDecl->hasTrivialDestructor()) return; 8999 if (ClassDecl->isDependentContext()) return; 9000 9001 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9002 MarkDeclarationReferenced(VD->getLocation(), Destructor); 9003 CheckDestructorAccess(VD->getLocation(), Destructor, 9004 PDiag(diag::err_access_dtor_var) 9005 << VD->getDeclName() 9006 << VD->getType()); 9007 9008 if (!VD->hasGlobalStorage()) return; 9009 9010 // Emit warning for non-trivial dtor in global scope (a real global, 9011 // class-static, function-static). 9012 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9013 9014 // TODO: this should be re-enabled for static locals by !CXAAtExit 9015 if (!VD->isStaticLocal()) 9016 Diag(VD->getLocation(), diag::warn_global_destructor); 9017} 9018 9019/// AddCXXDirectInitializerToDecl - This action is called immediately after 9020/// ActOnDeclarator, when a C++ direct initializer is present. 9021/// e.g: "int x(1);" 9022void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 9023 SourceLocation LParenLoc, 9024 MultiExprArg Exprs, 9025 SourceLocation RParenLoc, 9026 bool TypeMayContainAuto) { 9027 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 9028 9029 // If there is no declaration, there was an error parsing it. Just ignore 9030 // the initializer. 9031 if (RealDecl == 0) 9032 return; 9033 9034 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 9035 if (!VDecl) { 9036 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 9037 RealDecl->setInvalidDecl(); 9038 return; 9039 } 9040 9041 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 9042 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 9043 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 9044 if (Exprs.size() > 1) { 9045 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 9046 diag::err_auto_var_init_multiple_expressions) 9047 << VDecl->getDeclName() << VDecl->getType() 9048 << VDecl->getSourceRange(); 9049 RealDecl->setInvalidDecl(); 9050 return; 9051 } 9052 9053 Expr *Init = Exprs.get()[0]; 9054 TypeSourceInfo *DeducedType = 0; 9055 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 9056 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 9057 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 9058 << Init->getSourceRange(); 9059 if (!DeducedType) { 9060 RealDecl->setInvalidDecl(); 9061 return; 9062 } 9063 VDecl->setTypeSourceInfo(DeducedType); 9064 VDecl->setType(DeducedType->getType()); 9065 9066 // In ARC, infer lifetime. 9067 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 9068 VDecl->setInvalidDecl(); 9069 9070 // If this is a redeclaration, check that the type we just deduced matches 9071 // the previously declared type. 9072 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 9073 MergeVarDeclTypes(VDecl, Old); 9074 } 9075 9076 // We will represent direct-initialization similarly to copy-initialization: 9077 // int x(1); -as-> int x = 1; 9078 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 9079 // 9080 // Clients that want to distinguish between the two forms, can check for 9081 // direct initializer using VarDecl::hasCXXDirectInitializer(). 9082 // A major benefit is that clients that don't particularly care about which 9083 // exactly form was it (like the CodeGen) can handle both cases without 9084 // special case code. 9085 9086 // C++ 8.5p11: 9087 // The form of initialization (using parentheses or '=') is generally 9088 // insignificant, but does matter when the entity being initialized has a 9089 // class type. 9090 9091 if (!VDecl->getType()->isDependentType() && 9092 !VDecl->getType()->isIncompleteArrayType() && 9093 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 9094 diag::err_typecheck_decl_incomplete_type)) { 9095 VDecl->setInvalidDecl(); 9096 return; 9097 } 9098 9099 // The variable can not have an abstract class type. 9100 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 9101 diag::err_abstract_type_in_decl, 9102 AbstractVariableType)) 9103 VDecl->setInvalidDecl(); 9104 9105 const VarDecl *Def; 9106 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 9107 Diag(VDecl->getLocation(), diag::err_redefinition) 9108 << VDecl->getDeclName(); 9109 Diag(Def->getLocation(), diag::note_previous_definition); 9110 VDecl->setInvalidDecl(); 9111 return; 9112 } 9113 9114 // C++ [class.static.data]p4 9115 // If a static data member is of const integral or const 9116 // enumeration type, its declaration in the class definition can 9117 // specify a constant-initializer which shall be an integral 9118 // constant expression (5.19). In that case, the member can appear 9119 // in integral constant expressions. The member shall still be 9120 // defined in a namespace scope if it is used in the program and the 9121 // namespace scope definition shall not contain an initializer. 9122 // 9123 // We already performed a redefinition check above, but for static 9124 // data members we also need to check whether there was an in-class 9125 // declaration with an initializer. 9126 const VarDecl* PrevInit = 0; 9127 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 9128 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 9129 Diag(PrevInit->getLocation(), diag::note_previous_definition); 9130 return; 9131 } 9132 9133 bool IsDependent = false; 9134 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 9135 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 9136 VDecl->setInvalidDecl(); 9137 return; 9138 } 9139 9140 if (Exprs.get()[I]->isTypeDependent()) 9141 IsDependent = true; 9142 } 9143 9144 // If either the declaration has a dependent type or if any of the 9145 // expressions is type-dependent, we represent the initialization 9146 // via a ParenListExpr for later use during template instantiation. 9147 if (VDecl->getType()->isDependentType() || IsDependent) { 9148 // Let clients know that initialization was done with a direct initializer. 9149 VDecl->setCXXDirectInitializer(true); 9150 9151 // Store the initialization expressions as a ParenListExpr. 9152 unsigned NumExprs = Exprs.size(); 9153 VDecl->setInit(new (Context) ParenListExpr( 9154 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 9155 VDecl->getType().getNonReferenceType())); 9156 return; 9157 } 9158 9159 // Capture the variable that is being initialized and the style of 9160 // initialization. 9161 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 9162 9163 // FIXME: Poor source location information. 9164 InitializationKind Kind 9165 = InitializationKind::CreateDirect(VDecl->getLocation(), 9166 LParenLoc, RParenLoc); 9167 9168 QualType T = VDecl->getType(); 9169 InitializationSequence InitSeq(*this, Entity, Kind, 9170 Exprs.get(), Exprs.size()); 9171 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 9172 if (Result.isInvalid()) { 9173 VDecl->setInvalidDecl(); 9174 return; 9175 } else if (T != VDecl->getType()) { 9176 VDecl->setType(T); 9177 Result.get()->setType(T); 9178 } 9179 9180 9181 Expr *Init = Result.get(); 9182 CheckImplicitConversions(Init, LParenLoc); 9183 9184 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 9185 !Init->isValueDependent() && 9186 !Init->isConstantInitializer(Context, 9187 VDecl->getType()->isReferenceType())) { 9188 // FIXME: Improve this diagnostic to explain why the initializer is not 9189 // a constant expression. 9190 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 9191 << VDecl << Init->getSourceRange(); 9192 } 9193 9194 Init = MaybeCreateExprWithCleanups(Init); 9195 VDecl->setInit(Init); 9196 VDecl->setCXXDirectInitializer(true); 9197 9198 CheckCompleteVariableDeclaration(VDecl); 9199} 9200 9201/// \brief Given a constructor and the set of arguments provided for the 9202/// constructor, convert the arguments and add any required default arguments 9203/// to form a proper call to this constructor. 9204/// 9205/// \returns true if an error occurred, false otherwise. 9206bool 9207Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9208 MultiExprArg ArgsPtr, 9209 SourceLocation Loc, 9210 ASTOwningVector<Expr*> &ConvertedArgs) { 9211 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9212 unsigned NumArgs = ArgsPtr.size(); 9213 Expr **Args = (Expr **)ArgsPtr.get(); 9214 9215 const FunctionProtoType *Proto 9216 = Constructor->getType()->getAs<FunctionProtoType>(); 9217 assert(Proto && "Constructor without a prototype?"); 9218 unsigned NumArgsInProto = Proto->getNumArgs(); 9219 9220 // If too few arguments are available, we'll fill in the rest with defaults. 9221 if (NumArgs < NumArgsInProto) 9222 ConvertedArgs.reserve(NumArgsInProto); 9223 else 9224 ConvertedArgs.reserve(NumArgs); 9225 9226 VariadicCallType CallType = 9227 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9228 SmallVector<Expr *, 8> AllArgs; 9229 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9230 Proto, 0, Args, NumArgs, AllArgs, 9231 CallType); 9232 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9233 ConvertedArgs.push_back(AllArgs[i]); 9234 return Invalid; 9235} 9236 9237static inline bool 9238CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9239 const FunctionDecl *FnDecl) { 9240 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9241 if (isa<NamespaceDecl>(DC)) { 9242 return SemaRef.Diag(FnDecl->getLocation(), 9243 diag::err_operator_new_delete_declared_in_namespace) 9244 << FnDecl->getDeclName(); 9245 } 9246 9247 if (isa<TranslationUnitDecl>(DC) && 9248 FnDecl->getStorageClass() == SC_Static) { 9249 return SemaRef.Diag(FnDecl->getLocation(), 9250 diag::err_operator_new_delete_declared_static) 9251 << FnDecl->getDeclName(); 9252 } 9253 9254 return false; 9255} 9256 9257static inline bool 9258CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9259 CanQualType ExpectedResultType, 9260 CanQualType ExpectedFirstParamType, 9261 unsigned DependentParamTypeDiag, 9262 unsigned InvalidParamTypeDiag) { 9263 QualType ResultType = 9264 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9265 9266 // Check that the result type is not dependent. 9267 if (ResultType->isDependentType()) 9268 return SemaRef.Diag(FnDecl->getLocation(), 9269 diag::err_operator_new_delete_dependent_result_type) 9270 << FnDecl->getDeclName() << ExpectedResultType; 9271 9272 // Check that the result type is what we expect. 9273 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9274 return SemaRef.Diag(FnDecl->getLocation(), 9275 diag::err_operator_new_delete_invalid_result_type) 9276 << FnDecl->getDeclName() << ExpectedResultType; 9277 9278 // A function template must have at least 2 parameters. 9279 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9280 return SemaRef.Diag(FnDecl->getLocation(), 9281 diag::err_operator_new_delete_template_too_few_parameters) 9282 << FnDecl->getDeclName(); 9283 9284 // The function decl must have at least 1 parameter. 9285 if (FnDecl->getNumParams() == 0) 9286 return SemaRef.Diag(FnDecl->getLocation(), 9287 diag::err_operator_new_delete_too_few_parameters) 9288 << FnDecl->getDeclName(); 9289 9290 // Check the the first parameter type is not dependent. 9291 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9292 if (FirstParamType->isDependentType()) 9293 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9294 << FnDecl->getDeclName() << ExpectedFirstParamType; 9295 9296 // Check that the first parameter type is what we expect. 9297 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9298 ExpectedFirstParamType) 9299 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9300 << FnDecl->getDeclName() << ExpectedFirstParamType; 9301 9302 return false; 9303} 9304 9305static bool 9306CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9307 // C++ [basic.stc.dynamic.allocation]p1: 9308 // A program is ill-formed if an allocation function is declared in a 9309 // namespace scope other than global scope or declared static in global 9310 // scope. 9311 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9312 return true; 9313 9314 CanQualType SizeTy = 9315 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9316 9317 // C++ [basic.stc.dynamic.allocation]p1: 9318 // The return type shall be void*. The first parameter shall have type 9319 // std::size_t. 9320 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9321 SizeTy, 9322 diag::err_operator_new_dependent_param_type, 9323 diag::err_operator_new_param_type)) 9324 return true; 9325 9326 // C++ [basic.stc.dynamic.allocation]p1: 9327 // The first parameter shall not have an associated default argument. 9328 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9329 return SemaRef.Diag(FnDecl->getLocation(), 9330 diag::err_operator_new_default_arg) 9331 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9332 9333 return false; 9334} 9335 9336static bool 9337CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9338 // C++ [basic.stc.dynamic.deallocation]p1: 9339 // A program is ill-formed if deallocation functions are declared in a 9340 // namespace scope other than global scope or declared static in global 9341 // scope. 9342 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9343 return true; 9344 9345 // C++ [basic.stc.dynamic.deallocation]p2: 9346 // Each deallocation function shall return void and its first parameter 9347 // shall be void*. 9348 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9349 SemaRef.Context.VoidPtrTy, 9350 diag::err_operator_delete_dependent_param_type, 9351 diag::err_operator_delete_param_type)) 9352 return true; 9353 9354 return false; 9355} 9356 9357/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9358/// of this overloaded operator is well-formed. If so, returns false; 9359/// otherwise, emits appropriate diagnostics and returns true. 9360bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9361 assert(FnDecl && FnDecl->isOverloadedOperator() && 9362 "Expected an overloaded operator declaration"); 9363 9364 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9365 9366 // C++ [over.oper]p5: 9367 // The allocation and deallocation functions, operator new, 9368 // operator new[], operator delete and operator delete[], are 9369 // described completely in 3.7.3. The attributes and restrictions 9370 // found in the rest of this subclause do not apply to them unless 9371 // explicitly stated in 3.7.3. 9372 if (Op == OO_Delete || Op == OO_Array_Delete) 9373 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9374 9375 if (Op == OO_New || Op == OO_Array_New) 9376 return CheckOperatorNewDeclaration(*this, FnDecl); 9377 9378 // C++ [over.oper]p6: 9379 // An operator function shall either be a non-static member 9380 // function or be a non-member function and have at least one 9381 // parameter whose type is a class, a reference to a class, an 9382 // enumeration, or a reference to an enumeration. 9383 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9384 if (MethodDecl->isStatic()) 9385 return Diag(FnDecl->getLocation(), 9386 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9387 } else { 9388 bool ClassOrEnumParam = false; 9389 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9390 ParamEnd = FnDecl->param_end(); 9391 Param != ParamEnd; ++Param) { 9392 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9393 if (ParamType->isDependentType() || ParamType->isRecordType() || 9394 ParamType->isEnumeralType()) { 9395 ClassOrEnumParam = true; 9396 break; 9397 } 9398 } 9399 9400 if (!ClassOrEnumParam) 9401 return Diag(FnDecl->getLocation(), 9402 diag::err_operator_overload_needs_class_or_enum) 9403 << FnDecl->getDeclName(); 9404 } 9405 9406 // C++ [over.oper]p8: 9407 // An operator function cannot have default arguments (8.3.6), 9408 // except where explicitly stated below. 9409 // 9410 // Only the function-call operator allows default arguments 9411 // (C++ [over.call]p1). 9412 if (Op != OO_Call) { 9413 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9414 Param != FnDecl->param_end(); ++Param) { 9415 if ((*Param)->hasDefaultArg()) 9416 return Diag((*Param)->getLocation(), 9417 diag::err_operator_overload_default_arg) 9418 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9419 } 9420 } 9421 9422 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9423 { false, false, false } 9424#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9425 , { Unary, Binary, MemberOnly } 9426#include "clang/Basic/OperatorKinds.def" 9427 }; 9428 9429 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9430 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9431 bool MustBeMemberOperator = OperatorUses[Op][2]; 9432 9433 // C++ [over.oper]p8: 9434 // [...] Operator functions cannot have more or fewer parameters 9435 // than the number required for the corresponding operator, as 9436 // described in the rest of this subclause. 9437 unsigned NumParams = FnDecl->getNumParams() 9438 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9439 if (Op != OO_Call && 9440 ((NumParams == 1 && !CanBeUnaryOperator) || 9441 (NumParams == 2 && !CanBeBinaryOperator) || 9442 (NumParams < 1) || (NumParams > 2))) { 9443 // We have the wrong number of parameters. 9444 unsigned ErrorKind; 9445 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9446 ErrorKind = 2; // 2 -> unary or binary. 9447 } else if (CanBeUnaryOperator) { 9448 ErrorKind = 0; // 0 -> unary 9449 } else { 9450 assert(CanBeBinaryOperator && 9451 "All non-call overloaded operators are unary or binary!"); 9452 ErrorKind = 1; // 1 -> binary 9453 } 9454 9455 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9456 << FnDecl->getDeclName() << NumParams << ErrorKind; 9457 } 9458 9459 // Overloaded operators other than operator() cannot be variadic. 9460 if (Op != OO_Call && 9461 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9462 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9463 << FnDecl->getDeclName(); 9464 } 9465 9466 // Some operators must be non-static member functions. 9467 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9468 return Diag(FnDecl->getLocation(), 9469 diag::err_operator_overload_must_be_member) 9470 << FnDecl->getDeclName(); 9471 } 9472 9473 // C++ [over.inc]p1: 9474 // The user-defined function called operator++ implements the 9475 // prefix and postfix ++ operator. If this function is a member 9476 // function with no parameters, or a non-member function with one 9477 // parameter of class or enumeration type, it defines the prefix 9478 // increment operator ++ for objects of that type. If the function 9479 // is a member function with one parameter (which shall be of type 9480 // int) or a non-member function with two parameters (the second 9481 // of which shall be of type int), it defines the postfix 9482 // increment operator ++ for objects of that type. 9483 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9484 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9485 bool ParamIsInt = false; 9486 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9487 ParamIsInt = BT->getKind() == BuiltinType::Int; 9488 9489 if (!ParamIsInt) 9490 return Diag(LastParam->getLocation(), 9491 diag::err_operator_overload_post_incdec_must_be_int) 9492 << LastParam->getType() << (Op == OO_MinusMinus); 9493 } 9494 9495 return false; 9496} 9497 9498/// CheckLiteralOperatorDeclaration - Check whether the declaration 9499/// of this literal operator function is well-formed. If so, returns 9500/// false; otherwise, emits appropriate diagnostics and returns true. 9501bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9502 DeclContext *DC = FnDecl->getDeclContext(); 9503 Decl::Kind Kind = DC->getDeclKind(); 9504 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9505 Kind != Decl::LinkageSpec) { 9506 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9507 << FnDecl->getDeclName(); 9508 return true; 9509 } 9510 9511 bool Valid = false; 9512 9513 // template <char...> type operator "" name() is the only valid template 9514 // signature, and the only valid signature with no parameters. 9515 if (FnDecl->param_size() == 0) { 9516 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9517 // Must have only one template parameter 9518 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9519 if (Params->size() == 1) { 9520 NonTypeTemplateParmDecl *PmDecl = 9521 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9522 9523 // The template parameter must be a char parameter pack. 9524 if (PmDecl && PmDecl->isTemplateParameterPack() && 9525 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9526 Valid = true; 9527 } 9528 } 9529 } else { 9530 // Check the first parameter 9531 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9532 9533 QualType T = (*Param)->getType(); 9534 9535 // unsigned long long int, long double, and any character type are allowed 9536 // as the only parameters. 9537 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9538 Context.hasSameType(T, Context.LongDoubleTy) || 9539 Context.hasSameType(T, Context.CharTy) || 9540 Context.hasSameType(T, Context.WCharTy) || 9541 Context.hasSameType(T, Context.Char16Ty) || 9542 Context.hasSameType(T, Context.Char32Ty)) { 9543 if (++Param == FnDecl->param_end()) 9544 Valid = true; 9545 goto FinishedParams; 9546 } 9547 9548 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9549 const PointerType *PT = T->getAs<PointerType>(); 9550 if (!PT) 9551 goto FinishedParams; 9552 T = PT->getPointeeType(); 9553 if (!T.isConstQualified()) 9554 goto FinishedParams; 9555 T = T.getUnqualifiedType(); 9556 9557 // Move on to the second parameter; 9558 ++Param; 9559 9560 // If there is no second parameter, the first must be a const char * 9561 if (Param == FnDecl->param_end()) { 9562 if (Context.hasSameType(T, Context.CharTy)) 9563 Valid = true; 9564 goto FinishedParams; 9565 } 9566 9567 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9568 // are allowed as the first parameter to a two-parameter function 9569 if (!(Context.hasSameType(T, Context.CharTy) || 9570 Context.hasSameType(T, Context.WCharTy) || 9571 Context.hasSameType(T, Context.Char16Ty) || 9572 Context.hasSameType(T, Context.Char32Ty))) 9573 goto FinishedParams; 9574 9575 // The second and final parameter must be an std::size_t 9576 T = (*Param)->getType().getUnqualifiedType(); 9577 if (Context.hasSameType(T, Context.getSizeType()) && 9578 ++Param == FnDecl->param_end()) 9579 Valid = true; 9580 } 9581 9582 // FIXME: This diagnostic is absolutely terrible. 9583FinishedParams: 9584 if (!Valid) { 9585 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9586 << FnDecl->getDeclName(); 9587 return true; 9588 } 9589 9590 StringRef LiteralName 9591 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9592 if (LiteralName[0] != '_') { 9593 // C++0x [usrlit.suffix]p1: 9594 // Literal suffix identifiers that do not start with an underscore are 9595 // reserved for future standardization. 9596 bool IsHexFloat = true; 9597 if (LiteralName.size() > 1 && 9598 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9599 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9600 if (!isdigit(LiteralName[I])) { 9601 IsHexFloat = false; 9602 break; 9603 } 9604 } 9605 } 9606 9607 if (IsHexFloat) 9608 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9609 << LiteralName; 9610 else 9611 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9612 } 9613 9614 return false; 9615} 9616 9617/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9618/// linkage specification, including the language and (if present) 9619/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9620/// the location of the language string literal, which is provided 9621/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9622/// the '{' brace. Otherwise, this linkage specification does not 9623/// have any braces. 9624Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9625 SourceLocation LangLoc, 9626 StringRef Lang, 9627 SourceLocation LBraceLoc) { 9628 LinkageSpecDecl::LanguageIDs Language; 9629 if (Lang == "\"C\"") 9630 Language = LinkageSpecDecl::lang_c; 9631 else if (Lang == "\"C++\"") 9632 Language = LinkageSpecDecl::lang_cxx; 9633 else { 9634 Diag(LangLoc, diag::err_bad_language); 9635 return 0; 9636 } 9637 9638 // FIXME: Add all the various semantics of linkage specifications 9639 9640 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9641 ExternLoc, LangLoc, Language); 9642 CurContext->addDecl(D); 9643 PushDeclContext(S, D); 9644 return D; 9645} 9646 9647/// ActOnFinishLinkageSpecification - Complete the definition of 9648/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9649/// valid, it's the position of the closing '}' brace in a linkage 9650/// specification that uses braces. 9651Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9652 Decl *LinkageSpec, 9653 SourceLocation RBraceLoc) { 9654 if (LinkageSpec) { 9655 if (RBraceLoc.isValid()) { 9656 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9657 LSDecl->setRBraceLoc(RBraceLoc); 9658 } 9659 PopDeclContext(); 9660 } 9661 return LinkageSpec; 9662} 9663 9664/// \brief Perform semantic analysis for the variable declaration that 9665/// occurs within a C++ catch clause, returning the newly-created 9666/// variable. 9667VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9668 TypeSourceInfo *TInfo, 9669 SourceLocation StartLoc, 9670 SourceLocation Loc, 9671 IdentifierInfo *Name) { 9672 bool Invalid = false; 9673 QualType ExDeclType = TInfo->getType(); 9674 9675 // Arrays and functions decay. 9676 if (ExDeclType->isArrayType()) 9677 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9678 else if (ExDeclType->isFunctionType()) 9679 ExDeclType = Context.getPointerType(ExDeclType); 9680 9681 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9682 // The exception-declaration shall not denote a pointer or reference to an 9683 // incomplete type, other than [cv] void*. 9684 // N2844 forbids rvalue references. 9685 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9686 Diag(Loc, diag::err_catch_rvalue_ref); 9687 Invalid = true; 9688 } 9689 9690 // GCC allows catching pointers and references to incomplete types 9691 // as an extension; so do we, but we warn by default. 9692 9693 QualType BaseType = ExDeclType; 9694 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9695 unsigned DK = diag::err_catch_incomplete; 9696 bool IncompleteCatchIsInvalid = true; 9697 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9698 BaseType = Ptr->getPointeeType(); 9699 Mode = 1; 9700 DK = diag::ext_catch_incomplete_ptr; 9701 IncompleteCatchIsInvalid = false; 9702 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9703 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9704 BaseType = Ref->getPointeeType(); 9705 Mode = 2; 9706 DK = diag::ext_catch_incomplete_ref; 9707 IncompleteCatchIsInvalid = false; 9708 } 9709 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9710 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9711 IncompleteCatchIsInvalid) 9712 Invalid = true; 9713 9714 if (!Invalid && !ExDeclType->isDependentType() && 9715 RequireNonAbstractType(Loc, ExDeclType, 9716 diag::err_abstract_type_in_decl, 9717 AbstractVariableType)) 9718 Invalid = true; 9719 9720 // Only the non-fragile NeXT runtime currently supports C++ catches 9721 // of ObjC types, and no runtime supports catching ObjC types by value. 9722 if (!Invalid && getLangOptions().ObjC1) { 9723 QualType T = ExDeclType; 9724 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9725 T = RT->getPointeeType(); 9726 9727 if (T->isObjCObjectType()) { 9728 Diag(Loc, diag::err_objc_object_catch); 9729 Invalid = true; 9730 } else if (T->isObjCObjectPointerType()) { 9731 if (!getLangOptions().ObjCNonFragileABI) 9732 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9733 } 9734 } 9735 9736 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9737 ExDeclType, TInfo, SC_None, SC_None); 9738 ExDecl->setExceptionVariable(true); 9739 9740 if (!Invalid && !ExDeclType->isDependentType()) { 9741 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9742 // C++ [except.handle]p16: 9743 // The object declared in an exception-declaration or, if the 9744 // exception-declaration does not specify a name, a temporary (12.2) is 9745 // copy-initialized (8.5) from the exception object. [...] 9746 // The object is destroyed when the handler exits, after the destruction 9747 // of any automatic objects initialized within the handler. 9748 // 9749 // We just pretend to initialize the object with itself, then make sure 9750 // it can be destroyed later. 9751 QualType initType = ExDeclType; 9752 9753 InitializedEntity entity = 9754 InitializedEntity::InitializeVariable(ExDecl); 9755 InitializationKind initKind = 9756 InitializationKind::CreateCopy(Loc, SourceLocation()); 9757 9758 Expr *opaqueValue = 9759 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9760 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9761 ExprResult result = sequence.Perform(*this, entity, initKind, 9762 MultiExprArg(&opaqueValue, 1)); 9763 if (result.isInvalid()) 9764 Invalid = true; 9765 else { 9766 // If the constructor used was non-trivial, set this as the 9767 // "initializer". 9768 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9769 if (!construct->getConstructor()->isTrivial()) { 9770 Expr *init = MaybeCreateExprWithCleanups(construct); 9771 ExDecl->setInit(init); 9772 } 9773 9774 // And make sure it's destructable. 9775 FinalizeVarWithDestructor(ExDecl, recordType); 9776 } 9777 } 9778 } 9779 9780 if (Invalid) 9781 ExDecl->setInvalidDecl(); 9782 9783 return ExDecl; 9784} 9785 9786/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9787/// handler. 9788Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9789 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9790 bool Invalid = D.isInvalidType(); 9791 9792 // Check for unexpanded parameter packs. 9793 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9794 UPPC_ExceptionType)) { 9795 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9796 D.getIdentifierLoc()); 9797 Invalid = true; 9798 } 9799 9800 IdentifierInfo *II = D.getIdentifier(); 9801 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9802 LookupOrdinaryName, 9803 ForRedeclaration)) { 9804 // The scope should be freshly made just for us. There is just no way 9805 // it contains any previous declaration. 9806 assert(!S->isDeclScope(PrevDecl)); 9807 if (PrevDecl->isTemplateParameter()) { 9808 // Maybe we will complain about the shadowed template parameter. 9809 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9810 } 9811 } 9812 9813 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9814 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9815 << D.getCXXScopeSpec().getRange(); 9816 Invalid = true; 9817 } 9818 9819 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9820 D.getSourceRange().getBegin(), 9821 D.getIdentifierLoc(), 9822 D.getIdentifier()); 9823 if (Invalid) 9824 ExDecl->setInvalidDecl(); 9825 9826 // Add the exception declaration into this scope. 9827 if (II) 9828 PushOnScopeChains(ExDecl, S); 9829 else 9830 CurContext->addDecl(ExDecl); 9831 9832 ProcessDeclAttributes(S, ExDecl, D); 9833 return ExDecl; 9834} 9835 9836Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9837 Expr *AssertExpr, 9838 Expr *AssertMessageExpr_, 9839 SourceLocation RParenLoc) { 9840 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9841 9842 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9843 llvm::APSInt Value(32); 9844 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9845 Diag(StaticAssertLoc, 9846 diag::err_static_assert_expression_is_not_constant) << 9847 AssertExpr->getSourceRange(); 9848 return 0; 9849 } 9850 9851 if (Value == 0) { 9852 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9853 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9854 } 9855 } 9856 9857 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9858 return 0; 9859 9860 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9861 AssertExpr, AssertMessage, RParenLoc); 9862 9863 CurContext->addDecl(Decl); 9864 return Decl; 9865} 9866 9867/// \brief Perform semantic analysis of the given friend type declaration. 9868/// 9869/// \returns A friend declaration that. 9870FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 9871 TypeSourceInfo *TSInfo) { 9872 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9873 9874 QualType T = TSInfo->getType(); 9875 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9876 9877 if (!getLangOptions().CPlusPlus0x) { 9878 // C++03 [class.friend]p2: 9879 // An elaborated-type-specifier shall be used in a friend declaration 9880 // for a class.* 9881 // 9882 // * The class-key of the elaborated-type-specifier is required. 9883 if (!ActiveTemplateInstantiations.empty()) { 9884 // Do not complain about the form of friend template types during 9885 // template instantiation; we will already have complained when the 9886 // template was declared. 9887 } else if (!T->isElaboratedTypeSpecifier()) { 9888 // If we evaluated the type to a record type, suggest putting 9889 // a tag in front. 9890 if (const RecordType *RT = T->getAs<RecordType>()) { 9891 RecordDecl *RD = RT->getDecl(); 9892 9893 std::string InsertionText = std::string(" ") + RD->getKindName(); 9894 9895 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 9896 << (unsigned) RD->getTagKind() 9897 << T 9898 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9899 InsertionText); 9900 } else { 9901 Diag(FriendLoc, diag::ext_nonclass_type_friend) 9902 << T 9903 << SourceRange(FriendLoc, TypeRange.getEnd()); 9904 } 9905 } else if (T->getAs<EnumType>()) { 9906 Diag(FriendLoc, diag::ext_enum_friend) 9907 << T 9908 << SourceRange(FriendLoc, TypeRange.getEnd()); 9909 } 9910 } 9911 9912 // C++0x [class.friend]p3: 9913 // If the type specifier in a friend declaration designates a (possibly 9914 // cv-qualified) class type, that class is declared as a friend; otherwise, 9915 // the friend declaration is ignored. 9916 9917 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9918 // in [class.friend]p3 that we do not implement. 9919 9920 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 9921} 9922 9923/// Handle a friend tag declaration where the scope specifier was 9924/// templated. 9925Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9926 unsigned TagSpec, SourceLocation TagLoc, 9927 CXXScopeSpec &SS, 9928 IdentifierInfo *Name, SourceLocation NameLoc, 9929 AttributeList *Attr, 9930 MultiTemplateParamsArg TempParamLists) { 9931 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9932 9933 bool isExplicitSpecialization = false; 9934 bool Invalid = false; 9935 9936 if (TemplateParameterList *TemplateParams 9937 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9938 TempParamLists.get(), 9939 TempParamLists.size(), 9940 /*friend*/ true, 9941 isExplicitSpecialization, 9942 Invalid)) { 9943 if (TemplateParams->size() > 0) { 9944 // This is a declaration of a class template. 9945 if (Invalid) 9946 return 0; 9947 9948 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9949 SS, Name, NameLoc, Attr, 9950 TemplateParams, AS_public, 9951 /*ModulePrivateLoc=*/SourceLocation(), 9952 TempParamLists.size() - 1, 9953 (TemplateParameterList**) TempParamLists.release()).take(); 9954 } else { 9955 // The "template<>" header is extraneous. 9956 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9957 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9958 isExplicitSpecialization = true; 9959 } 9960 } 9961 9962 if (Invalid) return 0; 9963 9964 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9965 9966 bool isAllExplicitSpecializations = true; 9967 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9968 if (TempParamLists.get()[I]->size()) { 9969 isAllExplicitSpecializations = false; 9970 break; 9971 } 9972 } 9973 9974 // FIXME: don't ignore attributes. 9975 9976 // If it's explicit specializations all the way down, just forget 9977 // about the template header and build an appropriate non-templated 9978 // friend. TODO: for source fidelity, remember the headers. 9979 if (isAllExplicitSpecializations) { 9980 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9981 ElaboratedTypeKeyword Keyword 9982 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9983 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9984 *Name, NameLoc); 9985 if (T.isNull()) 9986 return 0; 9987 9988 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9989 if (isa<DependentNameType>(T)) { 9990 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9991 TL.setKeywordLoc(TagLoc); 9992 TL.setQualifierLoc(QualifierLoc); 9993 TL.setNameLoc(NameLoc); 9994 } else { 9995 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9996 TL.setKeywordLoc(TagLoc); 9997 TL.setQualifierLoc(QualifierLoc); 9998 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9999 } 10000 10001 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10002 TSI, FriendLoc); 10003 Friend->setAccess(AS_public); 10004 CurContext->addDecl(Friend); 10005 return Friend; 10006 } 10007 10008 // Handle the case of a templated-scope friend class. e.g. 10009 // template <class T> class A<T>::B; 10010 // FIXME: we don't support these right now. 10011 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10012 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10013 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10014 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10015 TL.setKeywordLoc(TagLoc); 10016 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10017 TL.setNameLoc(NameLoc); 10018 10019 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10020 TSI, FriendLoc); 10021 Friend->setAccess(AS_public); 10022 Friend->setUnsupportedFriend(true); 10023 CurContext->addDecl(Friend); 10024 return Friend; 10025} 10026 10027 10028/// Handle a friend type declaration. This works in tandem with 10029/// ActOnTag. 10030/// 10031/// Notes on friend class templates: 10032/// 10033/// We generally treat friend class declarations as if they were 10034/// declaring a class. So, for example, the elaborated type specifier 10035/// in a friend declaration is required to obey the restrictions of a 10036/// class-head (i.e. no typedefs in the scope chain), template 10037/// parameters are required to match up with simple template-ids, &c. 10038/// However, unlike when declaring a template specialization, it's 10039/// okay to refer to a template specialization without an empty 10040/// template parameter declaration, e.g. 10041/// friend class A<T>::B<unsigned>; 10042/// We permit this as a special case; if there are any template 10043/// parameters present at all, require proper matching, i.e. 10044/// template <> template <class T> friend class A<int>::B; 10045Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10046 MultiTemplateParamsArg TempParams) { 10047 SourceLocation Loc = DS.getSourceRange().getBegin(); 10048 10049 assert(DS.isFriendSpecified()); 10050 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10051 10052 // Try to convert the decl specifier to a type. This works for 10053 // friend templates because ActOnTag never produces a ClassTemplateDecl 10054 // for a TUK_Friend. 10055 Declarator TheDeclarator(DS, Declarator::MemberContext); 10056 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10057 QualType T = TSI->getType(); 10058 if (TheDeclarator.isInvalidType()) 10059 return 0; 10060 10061 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10062 return 0; 10063 10064 // This is definitely an error in C++98. It's probably meant to 10065 // be forbidden in C++0x, too, but the specification is just 10066 // poorly written. 10067 // 10068 // The problem is with declarations like the following: 10069 // template <T> friend A<T>::foo; 10070 // where deciding whether a class C is a friend or not now hinges 10071 // on whether there exists an instantiation of A that causes 10072 // 'foo' to equal C. There are restrictions on class-heads 10073 // (which we declare (by fiat) elaborated friend declarations to 10074 // be) that makes this tractable. 10075 // 10076 // FIXME: handle "template <> friend class A<T>;", which 10077 // is possibly well-formed? Who even knows? 10078 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10079 Diag(Loc, diag::err_tagless_friend_type_template) 10080 << DS.getSourceRange(); 10081 return 0; 10082 } 10083 10084 // C++98 [class.friend]p1: A friend of a class is a function 10085 // or class that is not a member of the class . . . 10086 // This is fixed in DR77, which just barely didn't make the C++03 10087 // deadline. It's also a very silly restriction that seriously 10088 // affects inner classes and which nobody else seems to implement; 10089 // thus we never diagnose it, not even in -pedantic. 10090 // 10091 // But note that we could warn about it: it's always useless to 10092 // friend one of your own members (it's not, however, worthless to 10093 // friend a member of an arbitrary specialization of your template). 10094 10095 Decl *D; 10096 if (unsigned NumTempParamLists = TempParams.size()) 10097 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10098 NumTempParamLists, 10099 TempParams.release(), 10100 TSI, 10101 DS.getFriendSpecLoc()); 10102 else 10103 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 10104 10105 if (!D) 10106 return 0; 10107 10108 D->setAccess(AS_public); 10109 CurContext->addDecl(D); 10110 10111 return D; 10112} 10113 10114Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 10115 MultiTemplateParamsArg TemplateParams) { 10116 const DeclSpec &DS = D.getDeclSpec(); 10117 10118 assert(DS.isFriendSpecified()); 10119 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10120 10121 SourceLocation Loc = D.getIdentifierLoc(); 10122 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10123 QualType T = TInfo->getType(); 10124 10125 // C++ [class.friend]p1 10126 // A friend of a class is a function or class.... 10127 // Note that this sees through typedefs, which is intended. 10128 // It *doesn't* see through dependent types, which is correct 10129 // according to [temp.arg.type]p3: 10130 // If a declaration acquires a function type through a 10131 // type dependent on a template-parameter and this causes 10132 // a declaration that does not use the syntactic form of a 10133 // function declarator to have a function type, the program 10134 // is ill-formed. 10135 if (!T->isFunctionType()) { 10136 Diag(Loc, diag::err_unexpected_friend); 10137 10138 // It might be worthwhile to try to recover by creating an 10139 // appropriate declaration. 10140 return 0; 10141 } 10142 10143 // C++ [namespace.memdef]p3 10144 // - If a friend declaration in a non-local class first declares a 10145 // class or function, the friend class or function is a member 10146 // of the innermost enclosing namespace. 10147 // - The name of the friend is not found by simple name lookup 10148 // until a matching declaration is provided in that namespace 10149 // scope (either before or after the class declaration granting 10150 // friendship). 10151 // - If a friend function is called, its name may be found by the 10152 // name lookup that considers functions from namespaces and 10153 // classes associated with the types of the function arguments. 10154 // - When looking for a prior declaration of a class or a function 10155 // declared as a friend, scopes outside the innermost enclosing 10156 // namespace scope are not considered. 10157 10158 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10159 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10160 DeclarationName Name = NameInfo.getName(); 10161 assert(Name); 10162 10163 // Check for unexpanded parameter packs. 10164 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10165 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10166 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10167 return 0; 10168 10169 // The context we found the declaration in, or in which we should 10170 // create the declaration. 10171 DeclContext *DC; 10172 Scope *DCScope = S; 10173 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10174 ForRedeclaration); 10175 10176 // FIXME: there are different rules in local classes 10177 10178 // There are four cases here. 10179 // - There's no scope specifier, in which case we just go to the 10180 // appropriate scope and look for a function or function template 10181 // there as appropriate. 10182 // Recover from invalid scope qualifiers as if they just weren't there. 10183 if (SS.isInvalid() || !SS.isSet()) { 10184 // C++0x [namespace.memdef]p3: 10185 // If the name in a friend declaration is neither qualified nor 10186 // a template-id and the declaration is a function or an 10187 // elaborated-type-specifier, the lookup to determine whether 10188 // the entity has been previously declared shall not consider 10189 // any scopes outside the innermost enclosing namespace. 10190 // C++0x [class.friend]p11: 10191 // If a friend declaration appears in a local class and the name 10192 // specified is an unqualified name, a prior declaration is 10193 // looked up without considering scopes that are outside the 10194 // innermost enclosing non-class scope. For a friend function 10195 // declaration, if there is no prior declaration, the program is 10196 // ill-formed. 10197 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10198 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10199 10200 // Find the appropriate context according to the above. 10201 DC = CurContext; 10202 while (true) { 10203 // Skip class contexts. If someone can cite chapter and verse 10204 // for this behavior, that would be nice --- it's what GCC and 10205 // EDG do, and it seems like a reasonable intent, but the spec 10206 // really only says that checks for unqualified existing 10207 // declarations should stop at the nearest enclosing namespace, 10208 // not that they should only consider the nearest enclosing 10209 // namespace. 10210 while (DC->isRecord()) 10211 DC = DC->getParent(); 10212 10213 LookupQualifiedName(Previous, DC); 10214 10215 // TODO: decide what we think about using declarations. 10216 if (isLocal || !Previous.empty()) 10217 break; 10218 10219 if (isTemplateId) { 10220 if (isa<TranslationUnitDecl>(DC)) break; 10221 } else { 10222 if (DC->isFileContext()) break; 10223 } 10224 DC = DC->getParent(); 10225 } 10226 10227 // C++ [class.friend]p1: A friend of a class is a function or 10228 // class that is not a member of the class . . . 10229 // C++0x changes this for both friend types and functions. 10230 // Most C++ 98 compilers do seem to give an error here, so 10231 // we do, too. 10232 if (!Previous.empty() && DC->Equals(CurContext) 10233 && !getLangOptions().CPlusPlus0x) 10234 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 10235 10236 DCScope = getScopeForDeclContext(S, DC); 10237 10238 // C++ [class.friend]p6: 10239 // A function can be defined in a friend declaration of a class if and 10240 // only if the class is a non-local class (9.8), the function name is 10241 // unqualified, and the function has namespace scope. 10242 if (isLocal && IsDefinition) { 10243 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10244 } 10245 10246 // - There's a non-dependent scope specifier, in which case we 10247 // compute it and do a previous lookup there for a function 10248 // or function template. 10249 } else if (!SS.getScopeRep()->isDependent()) { 10250 DC = computeDeclContext(SS); 10251 if (!DC) return 0; 10252 10253 if (RequireCompleteDeclContext(SS, DC)) return 0; 10254 10255 LookupQualifiedName(Previous, DC); 10256 10257 // Ignore things found implicitly in the wrong scope. 10258 // TODO: better diagnostics for this case. Suggesting the right 10259 // qualified scope would be nice... 10260 LookupResult::Filter F = Previous.makeFilter(); 10261 while (F.hasNext()) { 10262 NamedDecl *D = F.next(); 10263 if (!DC->InEnclosingNamespaceSetOf( 10264 D->getDeclContext()->getRedeclContext())) 10265 F.erase(); 10266 } 10267 F.done(); 10268 10269 if (Previous.empty()) { 10270 D.setInvalidType(); 10271 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 10272 return 0; 10273 } 10274 10275 // C++ [class.friend]p1: A friend of a class is a function or 10276 // class that is not a member of the class . . . 10277 if (DC->Equals(CurContext)) 10278 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 10279 10280 if (IsDefinition) { 10281 // C++ [class.friend]p6: 10282 // A function can be defined in a friend declaration of a class if and 10283 // only if the class is a non-local class (9.8), the function name is 10284 // unqualified, and the function has namespace scope. 10285 SemaDiagnosticBuilder DB 10286 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10287 10288 DB << SS.getScopeRep(); 10289 if (DC->isFileContext()) 10290 DB << FixItHint::CreateRemoval(SS.getRange()); 10291 SS.clear(); 10292 } 10293 10294 // - There's a scope specifier that does not match any template 10295 // parameter lists, in which case we use some arbitrary context, 10296 // create a method or method template, and wait for instantiation. 10297 // - There's a scope specifier that does match some template 10298 // parameter lists, which we don't handle right now. 10299 } else { 10300 if (IsDefinition) { 10301 // C++ [class.friend]p6: 10302 // A function can be defined in a friend declaration of a class if and 10303 // only if the class is a non-local class (9.8), the function name is 10304 // unqualified, and the function has namespace scope. 10305 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10306 << SS.getScopeRep(); 10307 } 10308 10309 DC = CurContext; 10310 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10311 } 10312 10313 if (!DC->isRecord()) { 10314 // This implies that it has to be an operator or function. 10315 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10316 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10317 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10318 Diag(Loc, diag::err_introducing_special_friend) << 10319 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10320 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10321 return 0; 10322 } 10323 } 10324 10325 bool Redeclaration = false; 10326 bool AddToScope = true; 10327 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 10328 move(TemplateParams), 10329 IsDefinition, 10330 Redeclaration, AddToScope); 10331 if (!ND) return 0; 10332 10333 assert(ND->getDeclContext() == DC); 10334 assert(ND->getLexicalDeclContext() == CurContext); 10335 10336 // Add the function declaration to the appropriate lookup tables, 10337 // adjusting the redeclarations list as necessary. We don't 10338 // want to do this yet if the friending class is dependent. 10339 // 10340 // Also update the scope-based lookup if the target context's 10341 // lookup context is in lexical scope. 10342 if (!CurContext->isDependentContext()) { 10343 DC = DC->getRedeclContext(); 10344 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10345 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10346 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10347 } 10348 10349 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10350 D.getIdentifierLoc(), ND, 10351 DS.getFriendSpecLoc()); 10352 FrD->setAccess(AS_public); 10353 CurContext->addDecl(FrD); 10354 10355 if (ND->isInvalidDecl()) 10356 FrD->setInvalidDecl(); 10357 else { 10358 FunctionDecl *FD; 10359 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10360 FD = FTD->getTemplatedDecl(); 10361 else 10362 FD = cast<FunctionDecl>(ND); 10363 10364 // Mark templated-scope function declarations as unsupported. 10365 if (FD->getNumTemplateParameterLists()) 10366 FrD->setUnsupportedFriend(true); 10367 } 10368 10369 return ND; 10370} 10371 10372void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10373 AdjustDeclIfTemplate(Dcl); 10374 10375 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10376 if (!Fn) { 10377 Diag(DelLoc, diag::err_deleted_non_function); 10378 return; 10379 } 10380 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10381 Diag(DelLoc, diag::err_deleted_decl_not_first); 10382 Diag(Prev->getLocation(), diag::note_previous_declaration); 10383 // If the declaration wasn't the first, we delete the function anyway for 10384 // recovery. 10385 } 10386 Fn->setDeletedAsWritten(); 10387} 10388 10389void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10390 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10391 10392 if (MD) { 10393 if (MD->getParent()->isDependentType()) { 10394 MD->setDefaulted(); 10395 MD->setExplicitlyDefaulted(); 10396 return; 10397 } 10398 10399 CXXSpecialMember Member = getSpecialMember(MD); 10400 if (Member == CXXInvalid) { 10401 Diag(DefaultLoc, diag::err_default_special_members); 10402 return; 10403 } 10404 10405 MD->setDefaulted(); 10406 MD->setExplicitlyDefaulted(); 10407 10408 // If this definition appears within the record, do the checking when 10409 // the record is complete. 10410 const FunctionDecl *Primary = MD; 10411 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10412 // Find the uninstantiated declaration that actually had the '= default' 10413 // on it. 10414 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10415 10416 if (Primary == Primary->getCanonicalDecl()) 10417 return; 10418 10419 switch (Member) { 10420 case CXXDefaultConstructor: { 10421 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10422 CheckExplicitlyDefaultedDefaultConstructor(CD); 10423 if (!CD->isInvalidDecl()) 10424 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10425 break; 10426 } 10427 10428 case CXXCopyConstructor: { 10429 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10430 CheckExplicitlyDefaultedCopyConstructor(CD); 10431 if (!CD->isInvalidDecl()) 10432 DefineImplicitCopyConstructor(DefaultLoc, CD); 10433 break; 10434 } 10435 10436 case CXXCopyAssignment: { 10437 CheckExplicitlyDefaultedCopyAssignment(MD); 10438 if (!MD->isInvalidDecl()) 10439 DefineImplicitCopyAssignment(DefaultLoc, MD); 10440 break; 10441 } 10442 10443 case CXXDestructor: { 10444 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10445 CheckExplicitlyDefaultedDestructor(DD); 10446 if (!DD->isInvalidDecl()) 10447 DefineImplicitDestructor(DefaultLoc, DD); 10448 break; 10449 } 10450 10451 case CXXMoveConstructor: { 10452 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10453 CheckExplicitlyDefaultedMoveConstructor(CD); 10454 if (!CD->isInvalidDecl()) 10455 DefineImplicitMoveConstructor(DefaultLoc, CD); 10456 break; 10457 } 10458 10459 case CXXMoveAssignment: { 10460 CheckExplicitlyDefaultedMoveAssignment(MD); 10461 if (!MD->isInvalidDecl()) 10462 DefineImplicitMoveAssignment(DefaultLoc, MD); 10463 break; 10464 } 10465 10466 case CXXInvalid: 10467 llvm_unreachable("Invalid special member."); 10468 } 10469 } else { 10470 Diag(DefaultLoc, diag::err_default_special_members); 10471 } 10472} 10473 10474static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10475 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10476 Stmt *SubStmt = *CI; 10477 if (!SubStmt) 10478 continue; 10479 if (isa<ReturnStmt>(SubStmt)) 10480 Self.Diag(SubStmt->getSourceRange().getBegin(), 10481 diag::err_return_in_constructor_handler); 10482 if (!isa<Expr>(SubStmt)) 10483 SearchForReturnInStmt(Self, SubStmt); 10484 } 10485} 10486 10487void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10488 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10489 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10490 SearchForReturnInStmt(*this, Handler); 10491 } 10492} 10493 10494bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10495 const CXXMethodDecl *Old) { 10496 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10497 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10498 10499 if (Context.hasSameType(NewTy, OldTy) || 10500 NewTy->isDependentType() || OldTy->isDependentType()) 10501 return false; 10502 10503 // Check if the return types are covariant 10504 QualType NewClassTy, OldClassTy; 10505 10506 /// Both types must be pointers or references to classes. 10507 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10508 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10509 NewClassTy = NewPT->getPointeeType(); 10510 OldClassTy = OldPT->getPointeeType(); 10511 } 10512 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10513 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10514 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10515 NewClassTy = NewRT->getPointeeType(); 10516 OldClassTy = OldRT->getPointeeType(); 10517 } 10518 } 10519 } 10520 10521 // The return types aren't either both pointers or references to a class type. 10522 if (NewClassTy.isNull()) { 10523 Diag(New->getLocation(), 10524 diag::err_different_return_type_for_overriding_virtual_function) 10525 << New->getDeclName() << NewTy << OldTy; 10526 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10527 10528 return true; 10529 } 10530 10531 // C++ [class.virtual]p6: 10532 // If the return type of D::f differs from the return type of B::f, the 10533 // class type in the return type of D::f shall be complete at the point of 10534 // declaration of D::f or shall be the class type D. 10535 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10536 if (!RT->isBeingDefined() && 10537 RequireCompleteType(New->getLocation(), NewClassTy, 10538 PDiag(diag::err_covariant_return_incomplete) 10539 << New->getDeclName())) 10540 return true; 10541 } 10542 10543 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10544 // Check if the new class derives from the old class. 10545 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10546 Diag(New->getLocation(), 10547 diag::err_covariant_return_not_derived) 10548 << New->getDeclName() << NewTy << OldTy; 10549 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10550 return true; 10551 } 10552 10553 // Check if we the conversion from derived to base is valid. 10554 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10555 diag::err_covariant_return_inaccessible_base, 10556 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10557 // FIXME: Should this point to the return type? 10558 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10559 // FIXME: this note won't trigger for delayed access control 10560 // diagnostics, and it's impossible to get an undelayed error 10561 // here from access control during the original parse because 10562 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10563 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10564 return true; 10565 } 10566 } 10567 10568 // The qualifiers of the return types must be the same. 10569 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10570 Diag(New->getLocation(), 10571 diag::err_covariant_return_type_different_qualifications) 10572 << New->getDeclName() << NewTy << OldTy; 10573 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10574 return true; 10575 }; 10576 10577 10578 // The new class type must have the same or less qualifiers as the old type. 10579 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10580 Diag(New->getLocation(), 10581 diag::err_covariant_return_type_class_type_more_qualified) 10582 << New->getDeclName() << NewTy << OldTy; 10583 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10584 return true; 10585 }; 10586 10587 return false; 10588} 10589 10590/// \brief Mark the given method pure. 10591/// 10592/// \param Method the method to be marked pure. 10593/// 10594/// \param InitRange the source range that covers the "0" initializer. 10595bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10596 SourceLocation EndLoc = InitRange.getEnd(); 10597 if (EndLoc.isValid()) 10598 Method->setRangeEnd(EndLoc); 10599 10600 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10601 Method->setPure(); 10602 return false; 10603 } 10604 10605 if (!Method->isInvalidDecl()) 10606 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10607 << Method->getDeclName() << InitRange; 10608 return true; 10609} 10610 10611/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10612/// an initializer for the out-of-line declaration 'Dcl'. The scope 10613/// is a fresh scope pushed for just this purpose. 10614/// 10615/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10616/// static data member of class X, names should be looked up in the scope of 10617/// class X. 10618void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10619 // If there is no declaration, there was an error parsing it. 10620 if (D == 0 || D->isInvalidDecl()) return; 10621 10622 // We should only get called for declarations with scope specifiers, like: 10623 // int foo::bar; 10624 assert(D->isOutOfLine()); 10625 EnterDeclaratorContext(S, D->getDeclContext()); 10626} 10627 10628/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10629/// initializer for the out-of-line declaration 'D'. 10630void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10631 // If there is no declaration, there was an error parsing it. 10632 if (D == 0 || D->isInvalidDecl()) return; 10633 10634 assert(D->isOutOfLine()); 10635 ExitDeclaratorContext(S); 10636} 10637 10638/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10639/// C++ if/switch/while/for statement. 10640/// e.g: "if (int x = f()) {...}" 10641DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10642 // C++ 6.4p2: 10643 // The declarator shall not specify a function or an array. 10644 // The type-specifier-seq shall not contain typedef and shall not declare a 10645 // new class or enumeration. 10646 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10647 "Parser allowed 'typedef' as storage class of condition decl."); 10648 10649 Decl *Dcl = ActOnDeclarator(S, D); 10650 if (!Dcl) 10651 return true; 10652 10653 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10654 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10655 << D.getSourceRange(); 10656 return true; 10657 } 10658 10659 return Dcl; 10660} 10661 10662void Sema::LoadExternalVTableUses() { 10663 if (!ExternalSource) 10664 return; 10665 10666 SmallVector<ExternalVTableUse, 4> VTables; 10667 ExternalSource->ReadUsedVTables(VTables); 10668 SmallVector<VTableUse, 4> NewUses; 10669 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10670 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10671 = VTablesUsed.find(VTables[I].Record); 10672 // Even if a definition wasn't required before, it may be required now. 10673 if (Pos != VTablesUsed.end()) { 10674 if (!Pos->second && VTables[I].DefinitionRequired) 10675 Pos->second = true; 10676 continue; 10677 } 10678 10679 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10680 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10681 } 10682 10683 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10684} 10685 10686void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10687 bool DefinitionRequired) { 10688 // Ignore any vtable uses in unevaluated operands or for classes that do 10689 // not have a vtable. 10690 if (!Class->isDynamicClass() || Class->isDependentContext() || 10691 CurContext->isDependentContext() || 10692 ExprEvalContexts.back().Context == Unevaluated) 10693 return; 10694 10695 // Try to insert this class into the map. 10696 LoadExternalVTableUses(); 10697 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10698 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10699 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10700 if (!Pos.second) { 10701 // If we already had an entry, check to see if we are promoting this vtable 10702 // to required a definition. If so, we need to reappend to the VTableUses 10703 // list, since we may have already processed the first entry. 10704 if (DefinitionRequired && !Pos.first->second) { 10705 Pos.first->second = true; 10706 } else { 10707 // Otherwise, we can early exit. 10708 return; 10709 } 10710 } 10711 10712 // Local classes need to have their virtual members marked 10713 // immediately. For all other classes, we mark their virtual members 10714 // at the end of the translation unit. 10715 if (Class->isLocalClass()) 10716 MarkVirtualMembersReferenced(Loc, Class); 10717 else 10718 VTableUses.push_back(std::make_pair(Class, Loc)); 10719} 10720 10721bool Sema::DefineUsedVTables() { 10722 LoadExternalVTableUses(); 10723 if (VTableUses.empty()) 10724 return false; 10725 10726 // Note: The VTableUses vector could grow as a result of marking 10727 // the members of a class as "used", so we check the size each 10728 // time through the loop and prefer indices (with are stable) to 10729 // iterators (which are not). 10730 bool DefinedAnything = false; 10731 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10732 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10733 if (!Class) 10734 continue; 10735 10736 SourceLocation Loc = VTableUses[I].second; 10737 10738 // If this class has a key function, but that key function is 10739 // defined in another translation unit, we don't need to emit the 10740 // vtable even though we're using it. 10741 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10742 if (KeyFunction && !KeyFunction->hasBody()) { 10743 switch (KeyFunction->getTemplateSpecializationKind()) { 10744 case TSK_Undeclared: 10745 case TSK_ExplicitSpecialization: 10746 case TSK_ExplicitInstantiationDeclaration: 10747 // The key function is in another translation unit. 10748 continue; 10749 10750 case TSK_ExplicitInstantiationDefinition: 10751 case TSK_ImplicitInstantiation: 10752 // We will be instantiating the key function. 10753 break; 10754 } 10755 } else if (!KeyFunction) { 10756 // If we have a class with no key function that is the subject 10757 // of an explicit instantiation declaration, suppress the 10758 // vtable; it will live with the explicit instantiation 10759 // definition. 10760 bool IsExplicitInstantiationDeclaration 10761 = Class->getTemplateSpecializationKind() 10762 == TSK_ExplicitInstantiationDeclaration; 10763 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10764 REnd = Class->redecls_end(); 10765 R != REnd; ++R) { 10766 TemplateSpecializationKind TSK 10767 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10768 if (TSK == TSK_ExplicitInstantiationDeclaration) 10769 IsExplicitInstantiationDeclaration = true; 10770 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10771 IsExplicitInstantiationDeclaration = false; 10772 break; 10773 } 10774 } 10775 10776 if (IsExplicitInstantiationDeclaration) 10777 continue; 10778 } 10779 10780 // Mark all of the virtual members of this class as referenced, so 10781 // that we can build a vtable. Then, tell the AST consumer that a 10782 // vtable for this class is required. 10783 DefinedAnything = true; 10784 MarkVirtualMembersReferenced(Loc, Class); 10785 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10786 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10787 10788 // Optionally warn if we're emitting a weak vtable. 10789 if (Class->getLinkage() == ExternalLinkage && 10790 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10791 const FunctionDecl *KeyFunctionDef = 0; 10792 if (!KeyFunction || 10793 (KeyFunction->hasBody(KeyFunctionDef) && 10794 KeyFunctionDef->isInlined())) 10795 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10796 } 10797 } 10798 VTableUses.clear(); 10799 10800 return DefinedAnything; 10801} 10802 10803void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10804 const CXXRecordDecl *RD) { 10805 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10806 e = RD->method_end(); i != e; ++i) { 10807 CXXMethodDecl *MD = *i; 10808 10809 // C++ [basic.def.odr]p2: 10810 // [...] A virtual member function is used if it is not pure. [...] 10811 if (MD->isVirtual() && !MD->isPure()) 10812 MarkDeclarationReferenced(Loc, MD); 10813 } 10814 10815 // Only classes that have virtual bases need a VTT. 10816 if (RD->getNumVBases() == 0) 10817 return; 10818 10819 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10820 e = RD->bases_end(); i != e; ++i) { 10821 const CXXRecordDecl *Base = 10822 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10823 if (Base->getNumVBases() == 0) 10824 continue; 10825 MarkVirtualMembersReferenced(Loc, Base); 10826 } 10827} 10828 10829/// SetIvarInitializers - This routine builds initialization ASTs for the 10830/// Objective-C implementation whose ivars need be initialized. 10831void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10832 if (!getLangOptions().CPlusPlus) 10833 return; 10834 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10835 SmallVector<ObjCIvarDecl*, 8> ivars; 10836 CollectIvarsToConstructOrDestruct(OID, ivars); 10837 if (ivars.empty()) 10838 return; 10839 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10840 for (unsigned i = 0; i < ivars.size(); i++) { 10841 FieldDecl *Field = ivars[i]; 10842 if (Field->isInvalidDecl()) 10843 continue; 10844 10845 CXXCtorInitializer *Member; 10846 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10847 InitializationKind InitKind = 10848 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10849 10850 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10851 ExprResult MemberInit = 10852 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10853 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10854 // Note, MemberInit could actually come back empty if no initialization 10855 // is required (e.g., because it would call a trivial default constructor) 10856 if (!MemberInit.get() || MemberInit.isInvalid()) 10857 continue; 10858 10859 Member = 10860 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10861 SourceLocation(), 10862 MemberInit.takeAs<Expr>(), 10863 SourceLocation()); 10864 AllToInit.push_back(Member); 10865 10866 // Be sure that the destructor is accessible and is marked as referenced. 10867 if (const RecordType *RecordTy 10868 = Context.getBaseElementType(Field->getType()) 10869 ->getAs<RecordType>()) { 10870 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10871 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10872 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10873 CheckDestructorAccess(Field->getLocation(), Destructor, 10874 PDiag(diag::err_access_dtor_ivar) 10875 << Context.getBaseElementType(Field->getType())); 10876 } 10877 } 10878 } 10879 ObjCImplementation->setIvarInitializers(Context, 10880 AllToInit.data(), AllToInit.size()); 10881 } 10882} 10883 10884static 10885void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10886 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10887 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10888 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10889 Sema &S) { 10890 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10891 CE = Current.end(); 10892 if (Ctor->isInvalidDecl()) 10893 return; 10894 10895 const FunctionDecl *FNTarget = 0; 10896 CXXConstructorDecl *Target; 10897 10898 // We ignore the result here since if we don't have a body, Target will be 10899 // null below. 10900 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10901 Target 10902= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10903 10904 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10905 // Avoid dereferencing a null pointer here. 10906 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10907 10908 if (!Current.insert(Canonical)) 10909 return; 10910 10911 // We know that beyond here, we aren't chaining into a cycle. 10912 if (!Target || !Target->isDelegatingConstructor() || 10913 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10914 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10915 Valid.insert(*CI); 10916 Current.clear(); 10917 // We've hit a cycle. 10918 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10919 Current.count(TCanonical)) { 10920 // If we haven't diagnosed this cycle yet, do so now. 10921 if (!Invalid.count(TCanonical)) { 10922 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10923 diag::warn_delegating_ctor_cycle) 10924 << Ctor; 10925 10926 // Don't add a note for a function delegating directo to itself. 10927 if (TCanonical != Canonical) 10928 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10929 10930 CXXConstructorDecl *C = Target; 10931 while (C->getCanonicalDecl() != Canonical) { 10932 (void)C->getTargetConstructor()->hasBody(FNTarget); 10933 assert(FNTarget && "Ctor cycle through bodiless function"); 10934 10935 C 10936 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10937 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10938 } 10939 } 10940 10941 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10942 Invalid.insert(*CI); 10943 Current.clear(); 10944 } else { 10945 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10946 } 10947} 10948 10949 10950void Sema::CheckDelegatingCtorCycles() { 10951 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10952 10953 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10954 CE = Current.end(); 10955 10956 for (DelegatingCtorDeclsType::iterator 10957 I = DelegatingCtorDecls.begin(ExternalSource), 10958 E = DelegatingCtorDecls.end(); 10959 I != E; ++I) { 10960 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10961 } 10962 10963 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10964 (*CI)->setInvalidDecl(); 10965} 10966 10967/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10968Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10969 // Implicitly declared functions (e.g. copy constructors) are 10970 // __host__ __device__ 10971 if (D->isImplicit()) 10972 return CFT_HostDevice; 10973 10974 if (D->hasAttr<CUDAGlobalAttr>()) 10975 return CFT_Global; 10976 10977 if (D->hasAttr<CUDADeviceAttr>()) { 10978 if (D->hasAttr<CUDAHostAttr>()) 10979 return CFT_HostDevice; 10980 else 10981 return CFT_Device; 10982 } 10983 10984 return CFT_Host; 10985} 10986 10987bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10988 CUDAFunctionTarget CalleeTarget) { 10989 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10990 // Callable from the device only." 10991 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10992 return true; 10993 10994 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10995 // Callable from the host only." 10996 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10997 // Callable from the host only." 10998 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10999 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11000 return true; 11001 11002 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11003 return true; 11004 11005 return false; 11006} 11007